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Editorial Team
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Asked: 2026-06-11T18:52:22+00:00

Im working with a co-worker on Visual Studio, using the file upload control to

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Im working with a co-worker on Visual Studio, using the file upload control to allow the user to upload a file to the server, however I can’t seem to find a way to validate the file before allowing the upload.

For example I would like to stop them if they are trying to upload a file that is not relevant to their problem.

I am just starting on the asp.net side of things myself, so any shove in the right direction would be appreciated.

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1 Answer

  1. Editorial Team

    The default asp.net fileupload control does not provide this check.

    You can use a RegularExpressionValidator to validate the extension.

    <asp:RegularExpressionValidator ControlToValidate="FileUpload1" 
     ValidationExpression="^.*\.(png|PNG)$" runat="server" />

    The html accept attribute can come handy, but since this is not natively supported, you will have to add it yourself.

    <!-- Match all image files (image/*) and files with the extension ".someext" -->
<input type="file" accept=".someext,image/*">
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