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Showing posts from April, 2010

How to create new (missing) columns for entities in your Data Export Service Azure SQL database

*.dwp and *.webpart confusion about Web Part implementation and usage in SharePoint

Recently I was really confused about which type of web part deployment file extension I should use. After some research I figured the following out (which might be interesting for all SharePoint newbies):
.dwp is a web part description xml file used prior and up to SharePoint 2007/2010, therefore is still supported.webpart is the newer extension which came with MOSS 2007So whats the true difference:
.DWP:
It uses the following namespace xmlns=http://schemas.microsoft.com/WebPart/v2 by default.
The markup looks something like:
<?xmlversion="1.0"?><WebPartxmlns="http://schemas.microsoft.com/WebPart/v2"><Assembly>AssemblyName(with no .dll extension), Version=VersionNumber, Culture=Culture, PublicKeyToken=PublicKeyToken</Assembly><TypeName>WebPartNamespace.WebPartClassName</TypeName><Title>DefaultWebPartTitle</Title><Description>WebPartDescription</Description></WebPart>
Also interesting is tha…

SP Error: A Web Part you attempted to change is either invalid or has been removed by another user.

Today I tried to get a custom Sharepoint web part to work. It was no fun because I had a pretty simple (once you figured it out) and tedious error.

I added my custom web part on a standard SharePoint web part page and tried to edit the web part properties. I tried to just click on OK, Apply or Cancel I always got the following annoying message: A Web Part you attempted to change is either invalid or has been removed by another user. After spending a couple of hours, even with an experienced collegue, I finally found an interesting article:
http://williamvanstrien.blogspot.com/2010/01/alluserswebpart-and-spwebapplicationapp.html
William pointed out that it is a really bad thing to set the ID of a webpart control:
"...When you add a control within an .aspx file, Visual Studio automatically add a default 'ID' property to the control. For the default WebPart however this is not needed, the property is actually set when creating a publishing page off this PageLayout. But the mere p…