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Old February 24th, 2007, 09:38 AM
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No, you don't have to do that. What you need to do is check the uploaded file at the server before you save it. How you do this depends on the server side technology you're using. For example, in ASP.NET with C# you could so something like this:
if (FileUpload1.PostedFile.FileName.EndsWith(".jpg"))
  throw new Exception("Can't save files other than .jpg");
Instead of throwing an exception you could explain the user what went wrong.

If you're only allowing images, you could even try to load the image into an Image object wit GDI+ to ensure that the file really contains a readable image.


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