使用NuGet软件包管理器下载后，它位于Visual Studio 2012创建的packages文件夹中。

It's located in the packages folder created by Visual Studio 2012 after you use NuGet Package Manager to download it.

创建标签在Visual Studio中（您可以将其命名为Ajax Toolkit）。

Create a tab in Visual Studio (you can name it Ajax Toolkit).

右键单击它并选择：选择项目。

Right click on it and select: Choose Items..

点击浏览并导航至软件包Visual Studio 2012随您的源创建的文件夹。像这样的东西：..\packages\AjaxControlToolkit.7.0123\lib\40\AjaxControlToolkit.dll

Click Browse and navigate to the packages folder that Visual Studio 2012 creates with your source. Something like this: ..\packages\AjaxControlToolkit.7.0123\lib\40\AjaxControlToolkit.dll

选择AjaxControlToolKit。

Select AjaxControlToolKit.