using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; namespace eDosStation { public class TouchEnabledTextBox : TextBox { //inside the class definition private Process _touchKeyboardProcess = null; public TouchEnabledTextBox() { this.GotFocus += TouchEnabledTextBox_GotFocus; //this.GotTouchCapture += TouchEnabledTextBox_GotTouchCapture; this.LostFocus += TouchEnabledTextBox_LostFocus; } private void TouchEnabledTextBox_GotFocus(object sender, RoutedEventArgs e) { string touchKeyboardPath = @"C:\Program Files\Common Files\Microsoft Shared\Ink\TabTip.exe"; _touchKeyboardProcess = Process.Start(touchKeyboardPath); } private void TouchEnabledTextBox_GotTouchCapture(object sender, System.Windows.Input.TouchEventArgs e) { string touchKeyboardPath = @"C:\Program Files\Common Files\Microsoft Shared\Ink\TabTip.exe"; _touchKeyboardProcess= Process.Start(touchKeyboardPath); } //add this method as a member method of the class private void TouchEnabledTextBox_LostFocus(object sender, RoutedEventArgs eventArgs) { if (_touchKeyboardProcess != null) { _touchKeyboardProcess.Kill(); //nullify the instance pointing to the now-invalid process _touchKeyboardProcess = null; } } } }