I created a Sharepoint webpart with AjaxcontrolToolKit 4.0 tools and deployed it on to SharePoint and also put the AjaxcontrolToolKit.ddl in to the bin folder of my SharePoint webapplication. But I'm getting this error.
Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
Can anyone pls help me where it is going wrong.
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