private void DgwLinks_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
 {
     if (e.RowIndex > -1)
     {
         try {
             DataRow row          = ((DataTable)(DgwLinks.DataSource)).Rows[e.RowIndex];
             string  link         = (string)row["startLink"];
             Class   clickedClass = db.GetClassById((int)row["idClass"]);
             if (link.Substring(0, 4) == "http" || link.Contains(".exe"))
             {
                 Commons.ProcessStartLink(link);
             }
             else
             {
                 Commons.ProcessStartLink(clickedClass.PathRestrictedApplication + "\\" + link);
             }
         }
         catch (Exception ex)
         {
             Console.Beep();
         }
     }
 }