ERROR Could not load file or assembly AjaxControlToolkit or one of its dependencies

Question

I m deploying my website on the server   My website is done using asp net c  4 and EF 4   I receive 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   Any idea how could I fix it  Thanks for your time on this

User · Answer

If you are working with Source safe then make a new directory and take the latest there  this solved my issue   thanks

User · Answer

Right click in Project   Clean  That always works for me

User · Answer

Might sound obvious but do you definitely have AjaxControlToolkit dll in your bin

User · Answer

check below link in which you can download suitable AjaxControlToolkit which suits your  NET version    http   ajaxcontroltoolkit codeplex com releases view 43475  AjaxControlToolkit Binary NET4 zip - used for  NET 4 0  AjaxControlToolkit Binary NET35 zip - used for  NET 3 5

User · Answer

Just Add  AjaxControlToolkit dll to your Reference folder    On your Project Solution     Right Click on Reference Folder   gt  Add Reference  gt  browse  AjaxControlToolkit dll     Then build   Regards

User · Answer

It looks like you re trying to run it on a version of ASP NET which is running CLR v2  It s hard to know exactly what s going on without more information about how you ve deployed it  what version of IIS you re running etc  and to be frank I wouldn t be very much help at that point anyway  though others would   But basically  check your IIS and ASP NET set-up  and make sure that everything is running v4  Check your application pool configuration  etc

[c#] ERROR Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies

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