public MainWindow() { InitializeComponent(); run1 = true; run2 = false; MyDataGrid.SelectAll(); length = 10; txtinput.Text = "Scan Assemby No"; defectDesc.IsEnabled = false; defectDesc.Background = Brushes.White; Submit_Button.IsEnabled = false; NextButton.IsEnabled = false; PrevButton.IsEnabled = false; ReturnList = new ObservableCollection <CalData>(); DataContext = this; SerialNumber.Focus(); }