FileUpload Picture Extensions Only

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I have created an Fileupload that i only want to use for images that i have created from the toolbox but when browing i only want to allow picuture extensions? anyone that know how i could start?

Posted 26-Nov-12 21:48pm

Kurac1

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SoumenBanerjee · Answer 1 · 2012-11-26T22:02:00

You can get uploaded file's Extension like this and then validate or compare with your predefined list of extensions like this:

C#

if (fileupload1.HasFile)
{
FileInfo finfo = new FileInfo(fileupload1.FileName);
string fileExtension = finfo.Extension.ToLower();
/*compare this with a list of acceptable extensions..
 if it contains in list then
 fileupload1.SaveAs(filename);
 else return with a message..*/

}

Or by javascript you can try like this..

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
  <script language="JavaScript">
      function CheckType() {
          var id = document.getElementById('fileupload1').value;

          if (id != '') {
              var myextensions = /(.jpg|.jpeg|.gif)$/i;
              if (myextensions .test(id)) {
                  alert('OK');
              }
              else {
                  alert('Invalid file type.')
              }
          }
      }
</script>
</head>
<body>
    <asp:FileUpload ID="FileUpload1" runat="server" onChange="CheckType()" />
</body>
</html>