Developing SharePoint 2007 Webparts using Visual Studio 2010

Today I had a client that came to me that liked a web part that I had developed and wanted me to install it for them with some slight mods. No problem… Ohh wait, we developed that for SharePoint 2010 using Visual Studio 2010.

I am a huge fan of Visual Studio 2010 and its tight integration with SharePoint 2010 in its ability to quickly create features and write code like its supposed to be written (without the major headache!). Although WSPbuilder was the tool of chose for SP 2007, VS 2010 is now my new favourite weapon. With new functions like creating Visual Web Parts in a couple of clicks, features, deploy & debug with F5,  control over deployment and much more. Its fantastic, well done to Microsoft for making what should be a simple job easy again!

Since the release of SharePoint 2010 I now do a lot my development in SharePoint 2010 even if my client is running on SharePoint 2007. Why? Well because the API’s for SP 2007 & 2010 are very similar, and really haven’t effected much of my development to date. I find it so much easier to development in SP 2010 with Visual Studio 2010 especially when I run Windows 7 64-bit with SharePoint Foundation 2010 installed. Having this setup means that i can deploy directly from my local PC to a SharePoint environment for basic testing. No need to manually create project structure, manifiest files, signing of assembly, building wsps, manually deploying, attach to debug etc. Once I’m all done with development I package it up and deploy the wsp to the Sharepoint 2007 development for thorough testing. Provided I haven’t used any deprecated methods in the API, ill be all sweet. Good thing is if you have used and deprecated methods you wont be able to build solution, so you wont be doubt when deploying to SP 2007.


So i presume your reading this because you love the new Visual Studio 2010 but need to develop web parts for SharePoint 2007. Although the interface within Visual Studio doesn’t directly enable you to develop for 2007, it is possible with some minor changes to your project.

So for the purposes of this article I am going create a basic visual web part, something that was difficult to do in SharePoint 2007 development. This process should work for most project types available…

  1. Start New Project, select Visual Web Part
  2. Select – Deploy as a farm solution
  3. Write your custom web part. I have just created a simple web part that contains some text and a button. When the user clicks the button the button text will change.
  4. I now press F5 on the keyboard and Visual Studio will automatically build & deploy my web part to SharePoint 2010.
  5. I confirm it all works by adding the web part to the page. Great! But there is nothing special so far.
  6. Now to get it into SharePoint 2007! First lets try deploying the current wsp as it is…
  7. So we need to package up the solution.
  8. Grab the wsp from the bin folder
  9. Copy to SharePoint 2007 server.
  10. Deploy to 2007 env and we get an error. The error tells us that it found a version number in the manifest that it doesnt understand.
    image “Solution manifest for solution ’48cae4c9-68ba-cccf5a89304′ failed validation, file manifest.xml, line 2, character 110: The ‘SharePointProductVersion’ attribute is not declared.


After the steps above:

  1. Go back into Visual Studio 2010.
  2. Double click the “Package.package” file
  3. Select “Manifest” down the bottom. Notice where is reads SharePointProductVersion=”14.0” in the xml file.
  4. In the properties panel, clear out 14.0 in the SharePointProductVersion field. This removes the property all together from the manifest file.
  5. We also need to change the assembly reference in the project from Microsoft.SharePoint.dll 14.0 to 12.0.
    To do this you will need to click the show all files icon in the solution explorer panel.  image 

    -Next, delete out Microsoft.SharePoint & delete out Microsoft.SharePoint.Security as these wont be on the SP 2007 environment.-Then you want to add a reference to Microsoft.SharePoint.dll but make sure its the 12.0 version found in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\ISAPI\Microsoft.SharePoint.dll

  6. Because we have built a ‘Visual Web Part’, Visual Studio 2010 automattically adds some imports into the ascx user control file which wont exists in SP 2007. Therefore you need to comment these references out. Obviously if we were doing a coded web part or a event receiver we would not need to do this step.Mine currently looks like this.
  7. Package up your solution again and deploy on SP 2007 environment.
  8. Active, test and your good to go.
    SharePoint 2007 webpart


  • You will need Asp.Net 3.5 installed on your SharePoint 2007 environment.
  • This may not always be the right solution for you (depending on your project) but it certainly saves me a lot of time for those basic web parts.

6 Responses to Developing SharePoint 2007 Webparts using Visual Studio 2010

  1. cheer says:

    Hi Trent,

    your blog is very good and you have given very good explanation.
    But now i dont have any SP 2010 machine with me and has SP 2007 with VS 2010. Can you please tell me how can i create a webpart for SP 2007 with VS 2010?

  2. Rinaldo says:

    Great post, saved me a heap of time, thanks

  3. Pingback: Developing MOSS 2007 WebParts using VS 2010 « derby leeds blog

  4. sss says:


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