Yogesh
Please download the control again.
We have added new property DialogFilter.
Please make sure you still need to use the ValidateOption.AllowedFileExtensions to prevent the users upload all kind of files (IFrame mode or hack)
And you can set the DialogFilter by script:
var uploader=document.getElementById("<%=Uploader1.ClientID%>");
uploader.setdialogfilter("Images|*.jpg;*.gif|Documents|*.doc;*.txt");
I will tell you how to limit the file size by script later.
Regards,
Terry