private static void CostEST_Click(object Sender, EventArgs e)
 {
     try
     {
         if (!ModuleMain.IsCostfrmOpen)
         {
             Form CostFrm = new UPS_Manager.CostEst();
             CostFrm.Show();
             ModuleMain.IsCostfrmOpen = true;
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }
 private static void CostEST_Click(object Sender, EventArgs e)
 {
     try
     {
         if (!ModuleMain.IsCostfrmOpen)
         {
             Form CostFrm = new UPS_Manager.CostEst();
             CostFrm.Show();
             ModuleMain.IsCostfrmOpen = true;
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }