asp.net - FileUpload Validator error message always shown .net -

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i have problem code:

<asp:fileupload id="fulbrowse" runat="server" /> <asp:button id="btnload" runat="server" text="load" onclick="btnload_click" /> <asp:regularexpressionvalidator id="fulbrowsevalidator"                                 runat="server"                                 errormessage="upload zip or dxf files only"                                 validationexpression="^(([a-za-z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.zip|.zip|.dxf|.dxf)$"                                 controltovalidate="fulbrowse"> </asp:regularexpressionvalidator>

that is, if file uploaded zip or dxf, when function btnload_click ends, errormessage shown, .

here result:

my_result**

does know why?

thank you

**upload succesful label set when btnload_click ends.

i change validator ^.+[\.zip|\.zip|\.dxf|\.dxf]$ since file uploader validate filename (unless you're looking specific filename). can expand on zip/dfx case matching via \.zip|\.zip|... or can

disable client side scripting enableclientscript="false" , add

case insensitive flag (?i:^.+[\.zip|\.dxf]$)


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