Where can I find the assembly System Web Extensions dll

Question

I m messing around with some JSON and I m trying to use the JavascriptSeralizer Class but I cannot for the love of god find a link to find where to add the assembly to my project  Someone help please    Update  I m using  NET 4 0 and its not in the  Net tab when you right click on references -  add reference in the solution explorer of Visual C  2010

User · Answer

Your project is mostly likely targetting .NET Framework 4 Client Profile. Check the application tab in your project properties.

This question has a good answer on the different versions: Target framework, what does ".NET Framework ... Client Profile" mean?

User · Answer

The assembly was introduced with  NET 3 5 and is in the GAC   Simply add a  NET reference to your project   Project -  Right Click References -  Select  NET tab -  System Web Extensions  If it is not there  you need to install  NET 3 5 or 4 0

User · Answer

I had this issue when converting an older project to use a new version of Visual Studio  Upon conversion  the project target framework was set to 2 0  I was able to solve this issue by changing the target framework to be 3 5

User · Answer

EDIT    The info below is only applicable to VS2008 and the 3 5 framework  VS2010 has a new registry location  Further details can be found on MSDN  How to Add or Remove References in Visual Studio   ORIGINAL  It should be listed in the  NET tab of the Add Reference dialog  Assemblies that appear there have paths in registry keys under   HKLM Software Microsoft  NETFramework AssemblyFolders    I have a key there named Microsoft  NET Framework 3 5 Reference Assemblies with a string value of   C  Program Files Reference Assemblies Microsoft Framework v3 5    Navigating there I can see the actual System Web Extensions dll    EDIT   I found my  NET 4 0 version in   C  Program Files  x86  Reference Assemblies Microsoft Framework  NETFramework v4 0 System Web Extensions dll   I m running Win 7 64 bit  so if you re on a 32 bit OS drop the  x86

User · Answer

I had this problem myself   Most of the information I could find online was related to people having this problem with an ASP NET web application   I was creating a Win Forms stand alone app so most of the advice wasn t helpful for me   Turns out that the problem was that my project was set to use the   NET 4 Framework Client Profile  as the target framework and the System Web Extensions reference was not in the list for adding   I changed the target to   NET 4 Framework  and then the reference was available by the normal methods     Here is what worked for me step by step    Right Click you project Select Properties  Change your Target Framework to   NET Framework 4   Do whatever you need to do to save the changes and close the preferences tab  Right click on the References item in your Solution Explorer  Choose Add Reference     In the  NET tab  scroll down to System Web Extensions and add it

[c#] Where can I find the assembly System.Web.Extensions dll?

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