public void PositionFile(string sFileFullName)
        {
            if (!System.IO.File.Exists(sFileFullName)) return;

            System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("Explorer.exe");
            //string file = @"c:/windows/notepad.exe";
            psi.Arguments = " /select," + sFileFullName;
            System.Diagnostics.Process.Start(psi);
        }