using System.Text.RegularExpressions; using System.Windows.Input; namespace MtApi5TestClient { /// /// Interaction logic for MainWindow.xaml /// public partial class MainWindow { private ViewModel Vm { get; } public MainWindow() { InitializeComponent(); Vm = new ViewModel(); _MainLayout.DataContext = Vm; } private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) { Vm.Close(); } private void NumberValidationTextBox(object sender, TextCompositionEventArgs e) { var regex = new Regex("[^0-9]+"); e.Handled = regex.IsMatch(e.Text); } } }