System.Web.UI.HtmlControls.HtmlInputFile - Can't check if junk is typed into text field

I have in my C#/asp.net
System.Web.UI.HtmlControls.HtmlInputFile MyFile;

if ((MyFile.PostedFile.ContentLength  == 0) && (MyFile.PostedFile.FileName != ""))
 {
                strFileName = MyFile.PostedFile.FileName;
                FileUploadMsgLB.Text = "An Error occured. Please check the attached file: " + strFileName;
                return;
 }

It works fine,but if the user types junk into the text area (say "asdfg") my catch or If statements don't seem to be triggered and the web just sits there when the submit button is hit.

Funny thing is if the user types junk into the text area(say "c:asdfg" or "c:\asdfg" or "a:asdfg" ...) my catch statement is hit and error label is updated.





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