Uploading files to my ftp site instead of windows transfer

 i am trying to upload a file to my ftp but i am getting an error saying that it is missing a file name in the class
can anybody help with examples...
thank you
below is my code
 
FileName.InnerHtml = FileField.PostedFile.FileName
        FileContent.InnerHtml = FileField.PostedFile.ContentType
        FileSize.InnerHtml = FileField.PostedFile.ContentLength
        UploadDetails.Visible = True
        'Grab the file name from its fully qualified path at client
        Dim strFileName As String
        strFileName = FileField.PostedFile.FileName
        Dim c As String = System.IO.Path.GetFileName(strFileName)
     &nbs ...