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    <p>You could use a RegularExpressionValidator to validate if the user tries to upload jpeg-files or not:</p> <pre><code>&lt;asp:FileUpload ID="FileUpload1" runat="server" /&gt;&lt;br /&gt; &lt;br /&gt; &lt;asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Upload File" /&gt;&amp;nbsp;&lt;br /&gt; &lt;br /&gt; &lt;asp:Label ID="Label1" runat="server"&gt;&lt;/asp:Label&gt; &lt;asp:RegularExpressionValidator id="RegularExpressionValidator1" runat="server" ErrorMessage="Only jpeg files are allowed!" ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*)) +(.jpg|.JPG|.jpeg|.JPEG)$" ControlToValidate="FileUpload1"&gt;&lt;/asp:RegularExpressionValidator&gt; &lt;br /&gt; &lt;asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ErrorMessage="This is a required field!" ControlToValidate="FileUpload1"&gt;&lt;/asp:RequiredFieldValidator&gt; </code></pre> <p>on serverside:</p> <pre><code> protected void Button1_Click(object sender, EventArgs e) { if (FileUpload1.HasFile) { string fileExt = System.IO.Path.GetExtension(FileUpload1.FileName); if (fileExt == ".jpeg" || fileExt == ".jpg") { //do what you want with this file } else { Label1.Text = "Only .jpeg files allowed!"; } } else { Label1.Text = "You have not specified a file."; } } </code></pre> <p>You should know that any user could change the extension f.e. from .exe to .jpg. The only way i know to check for the real file-type would be to use function from <code>Urlmon.dll</code>. Have a look at this SO-question if you want further informations: <a href="https://stackoverflow.com/questions/58510/using-net-how-can-you-find-the-mime-type-of-a-file-based-on-the-file-signature">Using .NET, how can you find the mime type of a file based on the file signature not the extension</a></p>
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    1. POHow can i upload only jpeg files?
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    1. CO+1 for both server and client-side validation, in native ASP.
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      1. USBrad Christie
    2. COYou should rename those controls / methods. :)
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      1. USFilip Ekberg
    3. COIt's only an example, the OP didn't offer any markup, so i used this "anonymous" controls ;-)
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