File Upload filter images(gif,jpeg,png,...)

[sudheer]

 Hi 

In my application using radgrid i m uploading or editing documents with Fileupload 

control.

Mean while i have a combobox with items as "GENERAL,Accounts and sponsorlogo".

suppose if i select General or accounts ,am able to upload any time of contents. 

but if i select sposorlogo. i should be able to upload only images (like GIF,JPEG,PNG,BITMAP,..)

this should be acheived in opendialog box itself .and i don't want to acheive this by code like 

cases with extension in code behind.

(For quick understand if u try to convert RM to MP3 songs through RM to MP3 converter. 

While uploading if filters and lists only files with extension .RM not any other extension.)

Thanks for any help.