Posts by Simon Doy

I am an avid SharePoint enthusiast who works as an Independent SharePoint Consultant based in Leeds, United Kingdom. I am one of the organisers of the Yorkshire SharePoint User Group in the United Kingdom. I have been designing and building SharePoint solutions since 2006.

SharePoint 2013 Incoming Email Issue : Emails disappear



The other day we had a SharePoint 2013 development environment which had been configured up to receive email into libraries.

The configuration had been working for a while with no problems, there are issues with the incoming email on older versions of SharePoint 2013 but this farm was patched to May 2015.

We used the following Technet article to configure incoming email:

Unfortunately, email was never getting into SharePoint. The service had been working without any problems for a few weeks.


Problem Analysis


On investigation of the problem showed that email was successfully routed via Exchange to the SharePoint server via the locally installed SMTP service. The email was arriving successfully into the drop folder and after a few minutes the email disappeared. However, it would never appear in the document library! The email just disappeared.

Another symptom of the problem was seen when accessing the document library settings page for Incoming Email. Not all the settings would be loaded, the page was missing a large set of settings.

Normally the page looks like this :-



However, it was only showing this information :-



When someone attempted to make a change to the email settings for the list then the following error would be thrown:-

Server Error in '/' Application.

Error in the application.Description: An unhandled exception occurred during the execution of the current web request. 

Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: Microsoft.SharePoint.SPException: Error in the application.

Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: [SPException: Error in the application.]   
Microsoft.SharePoint.SPList.UpdateDirectoryManagementService(String oldAlias, String newAlias) +1239   
Microsoft.SharePoint.SPList.Update(Boolean bFromMigration) +311   
Microsoft.SharePoint.ApplicationPages.EmailSettingsPage.SubmitButton_Click(Object sender, EventArgs args) +1347   
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +146   
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3586

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34248


Strange behaviour indeed!

I fired up ULSViewer ( on the offending server. Whilst watching the ULS log, another email was sent to the document library. After a minute or so a message popped up.

Cannot load type EWSSharePointEventReceiver from Assembly: [Assembly Name].

So for some reason the assembly could not be loaded, hmm so why is that?
I had a look through the GAC and could find the assembly name. However, using a .Net Reflector such as Just Decompile ( or .NET Reflector ( I could see that the class was not in the assembly. Speaking with the developers, I found out the class names had been changed. So the next thing I checked was the event receivers.

With a bit of PowerShell, I found a set of event receivers which were being fired by the item email received event.

I removed the event receiver using the following PowerShell and running it in the SharePoint 2013 PowerShell Management Shell:-


$site = Get-SPSite $siteUrl;
$rootWeb = $site.RootWeb;
$allWebs = $rootWeb.AllWebs();

foreach($checkList in $allListsInWeb)        
	Write-Host "Checking List: " $checkList.Title " for event receiver class: " $eventReceiverName;
	$eventReceivers = $checkList.EventReceivers | ?{$_.Class -like $eventReceiverName};            
        If($eventReceivers -ne $null -and $eventReceivers.Count -gt 0)
             foreach($removeReceiver in $eventReceivers)                        
	           Write-Host "Removing Event Receiver: $removeReceiver";


After the corrupt event receivers were removed from the list then resending the email to SharePoint worked! Now the email appeared in the document library.

SharePoint 2013/Online Attachment Viewer Enhancement


Update: 22nd January 2016 – Further updates to fix an issue with Minimal Download Strategy (MDS) and works correctly when used in multiple list view app parts on the same page.

Recently I had a client that wanted a better way to get to the attachments that were linked to a SharePoint list item from a list view web part. This request had me thinking and I didn’t think it would be too difficult to achieve using SharePoint 2013’s Client Side Rendering (CSR) user interface components. Anyway one night I decided on an approach and put the following together. attachment-viewer-example


The solution uses client side rendering to override the output that the field displays in a list view. This is achieved using a list template override to change the Attachment’s field rendering. The solution makes use of the SharePoint Callout Manager which is used to display links to the attachment. I found a set of articles which have been posted in the Resources section below really good for getting to grips with using the Callout Manager. The implementation works on both SharePoint 2013 and SharePoint Online. The one issue with the approach is that you have to reference the JavaScript file for each view, so if you create a new view then that view needs to be setup. This isn’t a problem if you are creating a custom list with a schema.xml as you can reference the JavaScript in the list’s schema. The solution makes use of the SharePoint 2013 JSOM API and the list of attachments is only created one the user has clicked on the paperclip icon to see the list of attachments. This is to try and keep the load down on the server when there are lots of attachments for a particular list item.


The following websites provided a great resource in getting the Callout Manager and SharePoint JSOM working.

SharePoint 2013 – Custom CallOut with File Preview – Obilogic


Watch the video showing you how to setup the attachment viewer.

To take advantage of the list attachment viewer and set it up for a particular list view, do the following:-

  • Download the zipfile, found at the bottom of the post
  • Unzip the zip file to extract the ITSP.SP.AttachmentField.js file.
  • Upload the ITSP.SP.AttachmentField.js into a suitable location, I would suggest the Site Assets library.
    • Create a folder called Scripts within the Site Assets library
    • Upload the ITSP.SP.AttachmentField.js into this folder, this keeps your content organised.
    • Alternatively you could package up the JS file to deploy the files by using a Module into a site collection.
  • Browse to the SharePoint list that you wish to enable the viewer on.
    • Make sure that the list has the Attachment field showing as this is the column that is going to be overridden
  • Click “Edit Page”


  • Click on the List Viewer Web Part, choose Edit Web Part


  • The web part properties will appear on the right hand side
  • Expand the miscellaneous section
  • In the JSLink field type in the location of the ITSP.SP.AttachmentField.js file
  • E.g ~site/SiteAssets/Scripts/ITSP.SP.AttachmentField.js
  • Use the ~site token to substitute for the local site url


  • Click Apply
  • Click Ok
  • Save the Page

Now create a list item and add some attachments to it. When you click on the paperclip icon you will get a callout which will display all the attachments for that list item. attachment-viewer-paperclip attachment-viewer-example Please let me know if you find it useful, I have tested the script with 5/6 attachments, it should scale with 20 or so documents as the list of documents is built each time you click on a particular document.

Update 21st May 2014

A new version of the script has been released to add support for the Minimal Download Strategy feature. This helps to reduce the amount of bytes being downloaded to the client. For more information please read this MSDN Blog Post.

The behaviour that you would start seeing is that the attachment callout would appear once and then never again. More information can be found here:-

Update 17th November 2015

A new version of the script has been released to add support for being used in multiple list view app parts on the same page.
Please use this version instead.

Thanks to Dar for reporting this issue.

Update 4th January 2016

It seems that I did not do enough testing and a further issue was discovered by Ken when having multiple list view web parts on the page.

Update 22nd January 2016

There still seemed to be an issue with MDS and also the control was polluting the global JavaScript pool, this update fixed those has been tested on SharePoint Online.



How to: SharePoint Search PDF Document Preview using Acrobat


This is what we are looking to build, a SharePoint 2013 search experience where PDFs can be previewed within Search.



On a recent project I built a solution which made extensive use of the SharePoint 2013 search features. Microsoft have been pushing building solutions with SharePoint 2013 and I have to say it does give a great experience in terms of performance and functionality.

One of the main reasons for selecting search based solution is that it scales and this solution needed to provide quick access to documents. The complexity was that due to the nature of the documents they each had unique security permissions. The solution stored a few hundred thousand documents, this would have been a killer for performance if using traditional data querying methods.

95% of the documents were PDFs and I thought it would be cool if we could provide a preview of the PDF in the search results. Unfortunately we didn’t have Office Web Apps and so I started to think about how I could build something similar. The preview would work in a similar way to the search visualisation for Office when Office Web Apps is available.

At the time Office Web Apps wasn’t available and so we could use its ability to view PDFs.

One of the important goals was to ensure that the solution would show the PDF preview window in the hover panel but would also fail gracefully when a user didn’t have the necessary components installed on their machine.


The solution relies on the following:-

  • SharePoint 2013
  • SharePoint Search Centre
  • Custom Display Template
  • Acrobat Reader / Acrobat
  • Acrobat Reader / Acrobat’s Web Browser Browser Plugin
  • the PDF Object JavaScript library


Adobe Acrobat Reader Pre-requisite Configuration

As mentioned we need a few pre-requisites for this solution to work.

The user must have Acrobat or Acrobat Reader installed and configured to use the PDF Web Browser plugin. You can see my previous post, which explains how to enable the PDF Web Browser plugin.

Adobe Acrobat Reader can be downloaded from:


SharePoint 2013 Setup

So the SharePoint 2013 Search configuration requires the following:-

  • custom Search Item Display Template
  • custom Search Hover Panel Display Template
  • configured Search Result Type

The Search Result type is required to actually configure search to use our custom display templates to render PDF results with our preview hover panel.

We are expecting that you are using a search centre for the sake of this blog post but the solution could be deployed into any site collection.


Setting up display templates

Lets set this thing up. We will need to have a SharePoint 2013 Visual Studio project created so that we can put the display templates into source control, plus we need to be able to deploy them too!

  • Start Visual Studio 2012 / Visual Studio 2013
  • Create a new project using the SharePoint 2013 Empty Project
  • Give it a suitable name and location


  • Provide the URL to the SharePoint search centre site collection that will be used for development.
  • Choose a Sandbox Solution
  • Click Create

Once we have a Visual Studio project setup we need to create our display templates. The best way to learn is to take an existing display template and hover panel and make a new set. Display Templates are found in the master page document library. This can be found in a site collection’s root web, for example. http://sharepoint/search/_catalogs/masterpages.

Within the Master Pages document library is a sub folder called DisplayTemplates, this is where the Display Templates for the site collection are stored. I suggest that you create your own folder within this so that you can differentiate your changes from the out of the box display templates.

The deployment of display templates is a little tricky because they are made up of two parts. A display template is made up of an html file which SharePoint parses and creates a JavaScript representation of automatically. This occurs each time the .html file is saved.

Unfortunately if you deploy a Display Template via a feature the JavaScript representation is not created automatically. To get around this, I used the following process:-

As we mentioned earlier, we will create our display templates by copying an existing display template, renaming and modifying. This is achieved by the following:-

  • Browse to your SharePoint site.
  • Click on the cog icon in the top right hand section of the page. Click on Site Settings.
  • Click on display page layouts and master pages Pages link under “Look and Feel”.
  • Browse to the Display Templates folder
  • Download the following html display templates
  • Item_PDF.html and Item_PDF_HoverPanel.html

Now that we have a copy of the display templates, we need to add them to our Visual Studio project Create a new feature in Visual Studio by clicking on the Features node in the Solution Explorer window and choosing new feature.

  • Rename the feature folder to an appropriate name such as:-
    • PDFPreviewTemplateWithAcrobatimport
  • Open the new feature and fill in the feature’s information.


Next we will add a SharePoint Project Item to deploy the Display Templates.

  • Right-Click on the project and choose new item
  • From within the SharePoint project items choose the Module project item and call it something appropriate such as “PDFDisplayTemplates”
  • Drag the files into the newly created Project Item

If you cannot drag them then you are likely running Visual Studio as Administrator and you will need to copy the files into the folder created for PDFDisplayTemplates project item and then use the View All Files icon (found at the top of solution explorer) and add them by right clicking on each item and choosing “Include in Project” from the menu.

  • Next, rename the files to something appropriate, like this
    • item_pdf.html –> item_pdf_acrobat.html
    • item_pdf_hoverpanel.html –> item_pdf_acrobat_hoverpanel.html

Once you have uploaded your files into Visual Studio then we need to edit the files and configure Visual Studio to deploy the files as part of the solution by changing the file properties in Visual Studio solution explorer to change your deployment type from “No Deployment” to “Element File”.

We also need to update the display templates so that the name and description allows a user to identify the template. These descritions are modified using the metadata for the display template which isactually provided by a set of headers in the .html file.

Please see the screenshots below, we have modified the name and description to:-

  • Name: PDF Item with Acrobat
  • Description: Displays a result tailored for a Portable Document Format (PDF) document and displays a preview using Adobe Acrobat.






The last step is to add the PDFObject.js file to Visual Studio so that its deployed with the solution. We could do this in a number of ways, I am going to include it within the PDF Display Template feature so that we only have to activate the one feature.


Finally I am going to clean up the the feature’s element.xml file so that it is deployed into the correct location within SharePoint, if you remember it should be deployed into the masterpage document library.

So here is the element.xml before:-


and here is the element.xml after:-


Once you have updated your display template’s name then they are ready to be deployed to SharePoint via the visual studio solution. Install your solution and activate the feature that was created.


Modifying the display templates to show PDFs

Hopefully now you have the display templates uploaded into SharePoint, though they are just copies of an existing display templates, so we’ll need to update the display template with the code to show PDFs.

Next we need to modify the contents of the display template, I have already create updated versions which you can download but to lets give you an overview of what I have changed.



This has been modified so that the line reading

var hoverUrl = "~sitecollection/_catalogs/masterpage/Display Templates/Search/Item_PDF_HoverPanel.js";

is updated to the use are version of the hover panel.

var hoverUrl = "~sitecollection/_catalogs/masterpage/Display Templates/Search/item_pdf_acrobat_hoverpanel.js";


This has also been modified to update the name and description metadata elements. The entire html has been replaced and rather than explain all the changes, download the solution zip file and take a look at the file within Visual Studio.

The standout piece is the following section, which is called after the display template is rendered using the AddPostRenderCallback() function. This checks to see if the file is a pdf, and if it is will try and create the Acrobat Web Viewer window, if it fails for whatever reason the preview div is hidden.

AddPostRenderCallback(ctx, function()
var csrId = ctx.CurrentItem.csr_id;

var employeePDFDocument = new PDFObject({
url: $urlHtmlEncode(ctx.CurrentItem.OriginalPath),
pdfOpenParams: {
navpanes: 0,
toolbar: 0,
statusbar: 0,
view: "FitV"

}).embed($htmlEncode(id + HP.ids.viewer));
var viewDivId = $htmlEncode(id + HP.ids.viewer);
var viewDiv = document.getElementById(viewDivId);
{ = 'none';




Next the display templates need to be updated, I will show you the following approach which is the way that Microsoft recommend when developing display templates.

  • browse to the master page catalogue using http://sharepoint/search/_layouts/15/masterpages
  • click on the library tab in the ribbon toolbar
  • click on open in windows explorer
    • if you get an error make sure that IE is setup to include the web site in the Local Intranet zone and also if you are developing on Windows Server 2008/2012 make sure you have the Desktop Experience feature installed.
  • Once you have the windows explorer folder open you can now copy and paste the files from Visual Studio into Display Templates folder. SharePoint will take care of updating the JavaScript representation of your html file

Now we have our updated display templates we need to configure them to be used!


Configure search result: Tell SharePoint about the display templates

The approach to configuring search to use our display templates is by setting up a result type. Search Result types are the new Search Scopes but with SharePoint 2013 they also allow you to specify how each search result is displayed. This is really powerful and one of my favourite features of SharePoint 2013!

This feature allows you to have a list of search results and if a search result for example had a custom content type with custom metadata that result could be displayed differently to show that additional information.

Anyway, on to setting up the custom search result type:-

  • browse to your SharePoint search centre site collection
  • click on the cog icon and then choose site settings
  • Click Search Result Types (under Site Collection Administrator heading)
  • Click new search result type
    • Name: PDF using Acrobat
    • Sources: All Sources
    • Type of Content: PDF
    • Display Template: PDF using Acrobat
    • Tick optimize for frequent use

Lets try it out!

Deploy the solution to your SharePoint environment and add some PDF content to your SharePoint sites. Perform an incremental crawl or wait for your continuous crawl to pick up the content.

If you perform a search for  pdf, you should get some search results with the content uploaded, as you hover over the PDF search result you should get a preview of the PDF!



Troubleshooting the solution

Then the solution was being built then there were a couple of problems that I had. To be honest most of the issues were down to the Adobe Acrobat configuration.

Please take a look at my post Opening PDFs in a New Window and the section


Solution Files and resources

The Visual Studio Project, PowerShell script and Display Templates can be found here:



PowerShell: Deleting SharePoint List Items


Whilst I love SharePoint Workflows and how versatile they can be, they can generate quite a bit of data. Well mine do as I like to log plenty of information so that the support / admin teams can find out what’s going on with the workflow.

Unfortunately when you log plenty of information this means that the workflow history list can get quite large.

One of the workflows that we built over a ten month period has processed a couple of hundred thousand list items and has created about 3 million list items in the workflow history list.

We wanted to clear down this list and so PowerShell came to the rescue.


We built the following PowerShell script which you provide the following parameters:0

  • Url – Url of web hosting the workflow history list
  • AgeOfItemsToDelete – days of logs that you wish to keep
  • ListName – the display name of the workflow history list
  • NumberOfItemsInBatch – the number of items that should be returned in each query.

The original script looked like this:-

	[Parameter(Mandatory=$false, HelpMessage='System Host Url')]
	[string]$Url = "http://sharepoint",
	[Parameter(Mandatory=$false, HelpMessage='List Name')]
	[string]$ListName = "Workflow Tasks",
	[Parameter(Mandatory=$false, HelpMessage='Age of items in list to keep (number of days).')]
	[int]$AgeOfItemsToKeepInDays = 365,
	[Parameter(Mandatory=$false, HelpMessage='What size batch should we delete the items in?')]
	[int]$NumberOfItemsToDeleteInBatch = 1000

$assignmentCollection = Start-SPAssignment -Global;

$rootWeb=Get-SPWeb $Url -AssignmentCollection $assignmentCollection;

$listToProcess = $rootWeb.Lists.TryGetList($ListName);
if($listToProcess -ne $null)
	$startTime = [DateTime]::Now;
	$numberOfDaysToDelete = [TimeSpan]::FromDays($AgeOfItemsToKeepInDays);
	$deleteItemsOlderThanDate = [DateTime]::Now.Subtract($numberOfDaysToDelete);
	$isoDeleteItemsOlderThanDate = [Microsoft.SharePoint.Utilities.SPUtility]::CreateISO8601DateTimeFromSystemDateTime($deleteItemsOlderThanDate);
	$numberOfItemsToRetrieve = $NumberOfItemsToDeleteInBatch;
	$camlQueryString = [String]::Format("<Where><Leq><FieldRef Name='Modified' /><Value IncludeTimeValue='TRUE' Type='DateTime'>{0}</Value></Leq></Where>", $isoDeleteItemsOlderThanDate);
	$camlQuery = New-Object -TypeName "Microsoft.SharePoint.SPQuery" -ArgumentList @($listToProcess.DefaultView);
		$camlResults = [Microsoft.SharePoint.SPListItemCollection] $listToProcess.GetItems($camlQuery);
		$itemsCountReturnedByQuery = $camlResults.Count;
		Write-Host "Executed Query and found " $camlResults.Count " Items";
		$listItemDataTable = [System.Data.DataTable]$camlResults.GetDataTable();
		foreach($listItemRow in $listItemDataTable.Rows)
			$listItemIdToDelete = $listItemRow["ID"];
			$listItemModifiedDate = $listItemRow["Modified"];
			Write-Host "Deleting Item $listItemIdToDelete - Modified $listItemModifiedDate";
			$listItemToDelete = $listToProcess.GetItemById($listItemIdToDelete);
	while($itemsCountReturnedByQuery -gt 0)
	$totalSecondsTaken = [DateTime]::Now.Subtract($startTime).TotalSeconds;
	Write-Host -ForegroundColor Green "Processing took $totalSecondsTaken seconds to delete $deletedItemCount Item(s).";
	Write-Host "Cannot find list: " $ListName;

Stop-SPAssignment -Global -AssignmentCollection $assignmentCollection;

Write-Host "Finished";

However, whilst this worked ok for a list that was quite small. When we went to use it on the Production environment it performed like a dog. Fortunately the script was run out of hours so didn’t impact the environment too much. Though the memory that it consumed was quite large (4GB) after deleting the second item.

There was something seriously wrong with approach being taken, so after a bit of investigation it was obvious what was going on.

Look at the script again, there is a line of code that is:-


Well it turns out that this call, updates the collection after the DeleteItemById function is called. So we made a small modification and the offensive line became:-

$listItemToDelete = $listToProcess.GetItemById($listItemIdToDelete);

This change meant that the PowerShell session now only consumed 270Mb (I say only!) and memory usage did not rise. The deletion of the items was much quicker too, probably by a few 1000%!

Here is the final script for completeness.

[Parameter(Mandatory=$false, HelpMessage='System Host Url')]
[string]$Url = "<a href="http://sharepoint&quot;">http://sharepoint"</a>,
[Parameter(Mandatory=$false, HelpMessage='List Name')]
[string]$ListName = "Workflow Tasks",
[Parameter(Mandatory=$false, HelpMessage='Age of items in list to keep (number of days).')]
[int]$AgeOfItemsToKeepInDays = 365,
[Parameter(Mandatory=$false, HelpMessage='What size batch should we delete the items in?')]
[int]$NumberOfItemsToDeleteInBatch = 1000


$assignmentCollection = Start-SPAssignment -Global;

$rootWeb=Get-SPWeb $Url -AssignmentCollection $assignmentCollection;

$listToProcess = $rootWeb.Lists.TryGetList($ListName);
if($listToProcess -ne $null)
$startTime = [DateTime]::Now;
$numberOfDaysToDelete = [TimeSpan]::FromDays($AgeOfItemsToKeepInDays);
$deleteItemsOlderThanDate = [DateTime]::Now.Subtract($numberOfDaysToDelete);
$isoDeleteItemsOlderThanDate = [Microsoft.SharePoint.Utilities.SPUtility]::CreateISO8601DateTimeFromSystemDateTime($deleteItemsOlderThanDate);
$numberOfItemsToRetrieve = $NumberOfItemsToDeleteInBatch;

$camlQueryString = [String]::Format("&lt;Where&gt;&lt;Leq&gt;&lt;FieldRef Name='Modified' /&gt;&lt;Value IncludeTimeValue='TRUE' Type='DateTime'&gt;{0}&lt;/Value&gt;&lt;/Leq&gt;&lt;/Where&gt;", $isoDeleteItemsOlderThanDate);
$camlQuery = New-Object -TypeName "Microsoft.SharePoint.SPQuery" -ArgumentList @($listToProcess.DefaultView);


$camlResults = [Microsoft.SharePoint.SPListItemCollection] $listToProcess.GetItems($camlQuery);
$itemsCountReturnedByQuery = $camlResults.Count;
Write-Host "Executed Query and found " $camlResults.Count " Items";

$listItemDataTable = [System.Data.DataTable]$camlResults.GetDataTable();
foreach($listItemRow in $listItemDataTable.Rows)
$listItemIdToDelete = $listItemRow["ID"];
$listItemModifiedDate = $listItemRow["Modified"];
Write-Host "Deleting Item $listItemIdToDelete - Modified $listItemModifiedDate";
$listItemToDelete = $listToProcess.GetItemById($listItemIdToDelete);
while($itemsCountReturnedByQuery -gt 0)

$totalSecondsTaken = [DateTime]::Now.Subtract($startTime).TotalSeconds;
Write-Host -ForegroundColor Green "Processing took $totalSecondsTaken seconds to delete $deletedItemCount Item(s).";
Write-Host "Cannot find list: " $ListName;

Stop-SPAssignment -Global -AssignmentCollection $assignmentCollection;

Write-Host "Finished";

Hope that helps someone who has the same problem. Please let me know if you have an alternative solution!

Links to the scripts:-



PowerShell, SharePoint and Memory Leaks (Start-SPAssignment)


Over the last couple of years I have been using PowerShell to do more & more within my SharePoint environments.

Recently I have been writing a script to move a large number of SharePoint Web objects from one site collection to another.

Whilst this was being tested, it was obvious that something wasn’t quite right as I kept seeing the following messages in the ULS logs:-

Potential excessive number of SPRequest objects (60) currently unreleased on thread 10. Ensure that this object or its parent (such as an SPWeb or SPSite) is being properly disposed. This object is holding on to a separate native heap. This object will not be automatically disposed…


Now I am used to seeing these “Object Not disposed messages” in logs when writing code and the majority are easily fixed. Please see Stefan Goßner’s excellent article on Disposing of SPWeb and SPSite objects for more information.

The reason for the errors being displayed are that the objects are not being correctly disposed after they are used. This leads to the memory slowly being consumed and not released. Eventually if there are enough objects created, then memory pressure is placed on the server and performance is impacted.

With C# code this is easily sorted out by either calling .Dispose() or wrapping the code that creates the disposable object with a using() statement around the assignment line.
An example is shown below.

For example:-

using(SPWeb web=_site.OpenWeb(“http://sharepoint"))




//do something



However PowerShell objects such as the SPWebPipeBind object or SPSitePipeBind object don’t have a .Dispose() function. So how the heck do you stop them from leaking memory?

Well the secret is that you make use of the command Start-SPAssignment and Stop-SPAssignment cmdlets.

Start-SPAssignment / Stop-SPAssignment Cmdlets

Whilst using this commands I came across a number of blog posts but the approach that they were taken didn’t really work and I would still see the same memory leaks.
The set of Cmdlets should be used in the following fashion:-

$assignmentCollection = Start-SPAssignment;

$allWebs = Get-SPWeb –Site <a href="http://sharepoint">http://sharepoint</a> –AssignmentCollection $assignmentCollection

foreach($web in $allWebs)


Enable-SPFeature –Identity “Feature” –Url $web.Url –AssignmentCollection $assignmentCollection;


Stop-SPAssignment $assignmentCollection;

Walking through the code you will see that the Start-SPAssignment is used to return an SPAssignmentCollection object. We keep a reference to this SPAssignmentCollection so that we can use it to collect any objects that need disposing.

So the next question is how do we use the SPAssignmentCollection object to collect the objects?

Well a large number of the SharePoint PowerShell functions have an optional parameter called AssignmentCollection. The variable that we created using Start-SPAssignment should then be passed into these SharePoint PowerShell cmdlets.

For example, Get-SPWeb has the a set of parameters (content taken from TechNet):-

Parameter Required Description
Identity Optional Specifies the name or full or partial URL of the subsite. If you use a relative path, you must specify the Site parameter.A valid URL in the form http://server_name or a relative path in the form of /SubSites/MySubSite.
AssignmentCollection Optional Manages objects for the purpose of proper disposal. Use of objects, such as SPWeb or SPSite, can use large amounts of memory and use of these objects in Windows PowerShell scripts requires proper memory management. Using the SPAssignment object, you can assign objects to a variable and dispose of the objects after they are needed to free up memory. When SPWeb, SPSite, or SPSiteAdministration objects are used, the objects are automatically disposed of if an assignment collection or the Global parameter is not used.
Confirm Optional Prompts you for confirmation before executing the command. For more information, type the following command: get-help about_commonparameters
Filter Optional Specifies the server-side filter to use for the specified scope.The type must be a valid filter in the form {filterName <operator> “filterValue”}.
Limit Optional Limits the maximum number of subsites to return. The default value is 200. To return all sites, enter ALLThe type must be a valid number greater than 0 or ALL.
Site Optional Specifies the URL or GUID of the site collection from which to list subsites.The type must be a valid URL, in the form of http://server_name; a GUID, in the form 1234-5678-9807, or an SPSite object.
WhatIf Optional Displays a message that describes the effect of the command instead of executing the command. For more information, type the following command: get-help about_commonparameters

When the AssignmentCollection parameter is passed then the objects that are created by that function are then stored in this AssignmentCollection.

When the objects are no longer required then they can be released using:-

Stop-SPAssignment –AssignmentCollection $assignmentCollection

This will free the memory and the associated objects.

SPAssignment Modes of Operation

The SPAssignment cmdlets can be used in a couple of ways:-

  • Simple mode, which is used by passing the –Global switch which seems to start monitoring the objects being created and will ensure that they are all disposed of when you call Stop-SPAssignment.
  • Advanced mode, which is where you create an AssignmentCollection using Start-SPAssignment and then manage the entries added to the collection.

I prefer the advanced mode as you are in control of when objects are being disposed of and also after running your PowerShell script a few times you can see where the appropriate calls to release memory should be placed.

When to use Stop-SPAssignment

One of the mistakes that I made was not calling the Stop-SPAssignment at the right time.

For example, say we have a script which is looping through all the Site Collections in a Web Application and then looping through all the Webs in a Site Collection. For each web object an operation is performed such as enabling a feature.

Well I had put the Stop-SPAssignment function being called at the end of the function. Guess what happened?

The PowerShell script would eat loads of RAM. Actually the memory would be freed but with large web applications the PowerShell script would slowing down considerably as the memory allocated started to impact the server.

The fix was relatively simple, move the Stop-SPAssignment function to the end of each loop which processes each site collection. This kept the PowerShell script from consuming too much RAM and it  performed well.

Not too often

I could have moved the Stop-SPAssignment function so that it is called after each web has been processed, however my testing found that this slowed down the script too much as Stop-SPAssignment was called.


Using the SPAssignment cmdlets are essential to building production ready PowerShell scripts. They will ensure that the servers in your SharePoint farm are not affected by over zealous PowerShell scripts consuming huge quantities of RAM!

PowerShell Script: Add user as Site Collection Admin to all sites in Web Application




A few days ago I had a request from one of the SharePoint team. Could we give him Site Collection Admin rights to all site collections in a web application.

Now one method would be to use a Web Application User Policy (see below) and give them the full access permission.


However, we didn’t want to take that approach.

So we looked at using a PowerShell script. The important point was that we did not want to assign the permission using the Owner or SecondaryContact properties of the SPSiteobject. Instead we just wanted to add the user as the site collection admin.

When using the user interface this is achieved by doing the following:-

  • Browse to the site collection
  • Click Site Settings
  • Click Site collection administrators (Under Users and Permissions)
    • Add the user to the list and click OK.
      After a bit of investigation using PowerShell I could see how this permissions was set.



So to the solution, how is a user configured as a Site Collection Admin?

Well it turns out that its based on the following property, SPUser.IsSiteAdmin. Site Collection Administrators have the IsSiteAdmin property set to true.


Once that information had been understood, then the script was relatively easy and the following script was created:-

	[Parameter(Mandatory=$true, HelpMessage='username in format DOMAIN\username')]
	[string]$Username = "",
	[Parameter(Mandatory=$true, HelpMessage='url for web application e.g. http://collab')]
	[string]$WebApplicationUrl = ""


Write-Host "Setting up user $Username as site collection admin on all sitecollections in Web Application $WebApplicationUrl" -ForegroundColor White;
$webApplication = Get-SPWebApplication $WebApplicationUrl;

if($webApplication -ne $null)

foreach($siteCollection in $webApplication.Sites){
    Write-Host "Setting up user $Username as site collection admin for $siteCollection" -ForegroundColor White;
    $userToBeMadeSiteCollectionAdmin = $siteCollection.RootWeb.EnsureUser($Username);
    if($userToBeMadeSiteCollectionAdmin.IsSiteAdmin -ne $true)
        $userToBeMadeSiteCollectionAdmin.IsSiteAdmin = $true;
        Write-Host "User is now site collection admin for $siteCollection" -ForegroundColor Green;
        Write-Host "User is already site collection admin for $siteCollection" -ForegroundColor DarkYellow;

    Write-Host "Current Site Collection Admins for site: " $siteCollection.Url " " $siteCollection.RootWeb.SiteAdministrators;
	Write-Host "Could not find Web Application $WebApplicationUrl" -ForegroundColor Red;

The PowerShell script accepts the following parameters:-

  • -UserName – the user to add as a site collection admin (DOMAIN\username)
  • -WebApplication – the URL to the Web Application that should be updated

The script tries to get resolve the Web Application. The script then runs through each site collection in the web application and ensures that the user can be found in the site collection.

If the user is not already a site collection admin then the property is updated and the user object is saved.

The script is not perfect and could have a bit more exception handling, for example the Get-SPWebApplication call does not check the return value.


Anyway the link to the PowerShell script is below (just rename the file extension from .txt to ps1):-


SharePoint Development: Speed up development with Visual Studio CKSDEV Keyboard Shortcuts


Firstly if you are not using the CKSDEV Visual Studio extensions for SharePoint. Then please do yourself a favour and download them NOW!

Wes Hackett and the team have been doing an amazing job to save us time when developing SharePoint solutions.

You can download the Visual studio extension via Visual Studio’s gallery.

Keyboard Shortcuts

I have to say that I was a little late to the 1.2 release which I updated to in November even though it was out in August! Anyway this release is the best yet for SharePoint 2013 and Visual Studio 2012. Finally it includes a SharePoint solution deployment profile to update/upgrade your solutions. Finally, I can throw away my version!

Anyway, I noticed that there were lots more keyboard shortcuts (I am pretty sure these have been there for a while) but I wanted to start making use of them as it really makes life much easier.

Fortunately the CKSDEV development team have a strategy for the shortcut conventions so remembering them is made a little easier.

To recycle a process then the two stage shortcut will always use Alt+R

To attach the debugger to a process then the two stage shortcut will always use Alt + A

So here are the shortcuts which I use the most:-

  • Recycle SharePoint Application Pools
    • Alt+R, A
  • Recycle SharePoint Timer Service
    • Alt R. T
  • Attach debugger to SharePoint Application Pools
    • Alt A, S
  • Attach debugger to SharePoint Timer Service
    • Alt A, T

    This makes life so much easier when you are in the code, debug, fix, code, debug, fix cycle!