Cannot add AjaxContrlToolkit into Toolbox in Visual Studio 2012

Question

I have added AjaxControlToolkit for .NET 4 into my web form project through Nuget. But I cannot add the controls into my Toolbox in Visual Studio. The steps of adding the controls I used are exactly same with the answer of this post , but after I selected the .dll file and click "Open", this error keep coming up:

There are no components in 'My Project Location\\packages\\AjaxControlToolkit.7.0725\\lib\\40\\AjaxControlToolkit.dll' that can be placed on the toolbox.

My project is using .NET 4 also, I have checked it. I have done some research but there is no solution for this problem online! I also tried to add the toolkit from the zip file downloaded from the official website, same error! I don't know whether it is a Visual Studio problem. Please help me! This troublesome mystery has puzzled me for many days...

Thanks in advance!

Answer 1

试试这个新的Ajaxtoolkit ....... http：//ajaxcontroltoolkit.codeplex.com/releases/view/109918