I am trying to add an \"KeyPress\" event in a textbox (WinForm)
this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(CheckKeys);
>
You are mixing class libraries, don't use Windows Forms classes in a WPF project. Make it look like this:
public partial class Window1 : Window {
public Window1() {
InitializeComponent();
this.textBox1.KeyDown += new KeyEventHandler(textBox1_KeyDown);
}
private void textBox1_KeyDown(object sender, KeyEventArgs e) {
if (e.Key == Key.Enter) {
MessageBox.Show("Enter!");
e.Handled = true;
}
}
}