Problem in uploading ajax toolkit on web server

Respected Sir,

I have used Dropshow simple control in ajax control tool kit,

it's all run on localhost, but it's gave problem on web server which i deployed hall application

The error is as shown below:

It shows thatCould not found Micosoft.Extension.Design.Dll

I can solve that error by copying that dll file on my bin folder in server,

But how can i permanently removed that error ,

can you explain me ?

What ajax version i have to download for that ? pls give me proper guidance.

i m waiting for you response.

Happy Coding !

You can reference the Micosoft.Extension.Design.Dll into your project or add the Micosoft.Extension.Design.Dll into the GAC usint GACUTIL.EXE will install the dll into the gac.Hope this helps