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();
}