I am trying to use JavaScriptSerializer in my application.

I initially received

Cannot find JavaScriptSerializer

and I solved it by adding:

using System.Web.Script.Serialization;

But then the sub-keyword Script is underlined with a blue line:

The type or namespace 'Script' does not exist in the namespace
'System.Web' (are you missing an assembly reference?)

So I added to the project a reference to:

C:Program Files (x86)Reference AssembliesMicrosoftFramework.NETFrameworkv4.0System.Web.Extensions.dll

That didn't help. I am still receiving the same blue underline with same error. The reference is marked with an exclamation mark yellow warning:

I tried the suggested solutions on this thread, but as @user781490 indicated, they didn't help in my situation.

Any idea how to resolve this?