private void NewHostinUnit_Click(object sender, RoutedEventArgs e) { try { hostingUnit.Owner = FindHostWindow.host; bl.AddNewHostingUnit(hostingUnit); MessageBox.Show("your Hosting Unit have been added"); this.Close(); Window HostigUnitWin = new HostigUnitWin(); HostigUnitWin.Show(); } catch (Exception exp) { MessageBox.Show(exp.ToString()); } }