Hi all, I have a problem with regular expression validator. I have a file upload and I want to upload only Excel file. The problem is that after the postback, regular expression validator is shown. This is the code:
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="cmdUpload" runat="server" Text="Upload" ValidationGroup="Validators" /><br />
<asp:RequiredFieldValidator ID= ...
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