Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. The system cannot find the file specified

Question

I am working on sharepoint 2010. I have created a simple visual web part which contain one text box and I have added calendarextender to it. I have added ajaxcontrolto

Answer 1

Is the AjaxControlToolkit.dll in the bin directory after you deploy the site?

The assembly (AjaxControlToolkit.dll) needs to be deployed to the Global Assembly Cache (GAC) or put in the \BIN folder of the SharePoint site's folder.