error CS0234 The type or namespace name Script does not exist in the namespace System Web

Question

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 Assemblies Microsoft Framework NETFramework v4 0 System 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

User · Answer

Add System Web Extensions as a reference to your project  For Ref

User · Answer

I found this MSDN forum post which suggests two solutions to your problem   First solution  not recommended       Find the  Net Framework 3 5 and 2 0 folder      Copy  System Web Extensions dll from 3 5 and  System Web dll from 2 0 to the application folder      Add the reference to these two assemblies      Change the referenced assemblies property  setting  Copy Local  to true   And build to test your application to ensure all code can work   Second solution  Use a different class   library    The user who had posted the question claimed that Uri EscapeUriString and How to  Serialize and Deserialize JSON Data helped him replicate the behavior of JavaScriptSerializer   You could also try to use Json Net  It s a third party library and pretty powerful

User · Answer

Since JsonSerializer is deprecated in  Net 4 0  I used http   www newtonsoft com json to solve this issue   NuGet-   Install-Package Newtonsoft Json

User · Answer

I had the same  Script been underlined  I added a reference to System Web Extensions  Thereafter the Script was no longer underlined  Hope this helps someone

User · Answer

Just Add reference to System Web Extensions and happy to go

[c#] error CS0234: The type or namespace name 'Script' does not exist in the namespace 'System.Web'

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