<r>Check if you included the .net 4 version of System.Web.Extensions - there's a 3.5 version as well, but I don't think that one works.<br/>
<br/>
These steps work for me:<br/>
<br/>
- Create a new console application<br/>
<br/>
- Change the target to .net 4 instead of Client Profile<br/>
<br/>
- Add a reference to
System.Web.Extensions (4.0)<br/>
<br/>
- Have access to
JavaScriptSerializer in Program.cs now <E>:-)</E></r>
