IIS 7.0 Report viewer Setting

1) Click on MIME Types :- 
       
         Action Pen               :-  Add
         FileName Extension  :- .axd
         MIME Type               :- application/octet-stream

2) Click on Handler Mapping :-

        Action pan Click Add Manage Handler
        Then Enter
             Request path :- Reserved.ReportViewerWebControl.axd
             Type              :- Microsoft.Reporting.WebForms.HttpHandler
             Name            :- Reserved-ReportViewerWebControl-axd  

Now Restart The IIS MUST