Visual Studio requires a ScriptManager reference to compile Ajax enabled solution

The Problem

Visual Studio requires a ScriptManager to compile a Ajax enabled solution for a SharePoint web part.

Visual Studio Error on compile says:

Solution.cs: (Build Error)

Error    1    The type or namespace name ‘ScriptManager’ could not be found (are you missing a using directive or an assembly reference?)    C:\…\Solution.cs



The Solution:

A Reference dll is missing in your solution. You need to add a reference to System.Web.Extentions.

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