你好:
有可能是你安装的版本不对。
最好是通过Nuget Package Manager来安装,参考AjaxControlToolKit官网上的方法:
http://ajaxcontroltoolkit.codeplex.com/
从Nuget中安装之后在工具箱中选择"Choose Items..."选中Package文件夹下面的对应版本的AjaxControlToolkit.dll。我这样做了之后没有出现什么问题,我使用的是VS2013/Win8.1 X64。
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