I have tried to validate the File Upload Control to Upload only Video files. I have used the following validation expression in Regular Expression Control.


The above validation is working in IE and Chrome, but the Firefox not supported this expression.
So I googled for that, and I found a useful link http://forums.asp.net/t/1342216.aspx/1
By referring the above link, I have modified my expression as follows


After saving the page and I tested and got worked in all browsers.

After updating, the Regular expression control looks like as follows,

<asp:RegularExpressionValidator ID=”RegularExpressionValidator1″ runat=”server”
ErrorMessage=”Only video files are allowed.”
ControlToValidate=”fileUploadControl” >
Only Video files are allowed