How to filter FileUpload Control?

Question

How to add filter to the fileupload control in asp.net? I want a filter for Oasis File (.000).?

Please advice me... thank you very much!

Answer 1

You can use RegularExpressionValidator

<asp:RegularExpressionValidator ID="rexp" runat="server" ControlToValidate="fupProduct"
     ErrorMessage="Only .gif, .jpg, .png, .tiff and .jpeg" 
     ValidationExpression="(.*\.([Gg][Ii][Ff])|.*\.([Jj][Pp][Gg])|.*\.([Bb][Mm][Pp])|.*\.([pP][nN][gG])|.*\.([tT][iI][iI][fF])$)"></asp:RegularExpressionValidator>