In this post, we will learn how to add Ajax Control Toolkit in Visual Studio (step by step).
Let's Begin:
1. Click on Download button to download the latest release of 
AJAX Control Toolkit.
![]() 
 
Or Click on Downloads link in the menu and select the Ajax Control Toolkit release according to your need. On clicking, AJAX Control Toolkit starts downloading.
![]() 2.
 
2. Extract the downloaded file (I have extracted the file in C:\ Drive).
![]() 3.
 
3. Open Visual Studio, Right Click in ToolBox and then click on Add Tab.
![]() 
 
Provide a name to the tab so that you can find these controls easily. I have named it AJAX Control Toolkit. 
![]() 4.
 
4. Expand the Tab which we have created in the previous step and right click in it. Click on Choose Items.
![]() 5.
 
5. Click on the Browse button in Choose Toolbox items and go to the location where you have extracted the ajaxcontroltoolkit.
 
![]() 
 
Select AjaxControltoolkit.dll and then click on Open button. 
![]() 6.
 
6. After clicking on the Open button, Visual Studio displays a security warning. Click on Yes.
![]() 
 
All the controls present in AJAXControlToolkit.dll will be displayed. Click on OK.
![]() 
 
That's all. Now you will see all the controls present in AJAX Control Toolkit added under AJAC Control Toolkit tab in the ToolBox. 
![]() 
 Note: In the latest version of AJAX Control Toolkit you have to run the installer file in order to integrate Toolkit with Visual Studio.