load file to fileupload

hi, everyone
how to load a default file (example : noimage.gif) with fileupload if we not choose a file to upload?
here's my code:
if (FileUpload1.HasFile && FileUpload1.PostedFile == null)
            {              
                   ????        
            }
            else
            {
                binaryImage = new byte[FileUpload1.PostedFile.ContentLength];
              &n ...