title: Set a string to a fileupload as it's filename
body: <p>i have an update form for some of my data, if user entered an url for my fileupload in database,
  i want to show this url in fileupload as it's filename in my update form,
  actually i want have a code like this :</p>
  
  <p><code>FileUpload1.FileName = "My Path";</code></p>
  
  <p>of course i know <code>fileName</code> in a <code>readOnly</code> property,
  could u please help me?</p>