solving error #2104 “Could not download the Silverlight application.”

This error generally occurs when the silver light file types are not registered as MIME types in the web server. To fix this error please follow the following guide lines.
1. Go to
inetmgr — > select ur silverlight applciation –>Right click Properties –> HTTP Headers — MIME Map –> File Types — New Types –>

2. Add one by one the below mentioned:

Associated Extension Content Type(MIME)

.xaml application/xaml+xml
.xap application/x-silverlight-app
.manifest application/manifest
.application application/x-ms-application
.xbap application/x-ms-xbap
.deploy application/octet-stream
.xps application/vnd.ms-xpsdocument
3. Click OK and close the dialog.