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我有以下几行:

[System.Diagnostics.DebuggerNonUserCodeAttribute()] private global::AjaxControlToolkit.ToolkitScriptManager @__BuildControlToolkitScriptManager1() { global::AjaxControlToolkit.ToolkitScriptManager @__ctrl;

我得到了这个错误:

The type 'System.Web.UI.ScriptManager' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

我选择Add Reference>.Net>system.web.extension version 4.0了视觉网络开发人员,但仍然得到同样的错误。

我能做些什么?

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