"KeyPress" event for WinForms textbox is missing?

Question

I am trying to add an "KeyPress" event in a textbox (WinForm)

this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(CheckKeys);

and here's inside the 'CheckKeys':

private void CheckKeys(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
    if (e.KeyChar == (char)13)
    {
        // Enter is pressed - do something

    }
}

The idea here is that once a textbox is in focus and the 'Enter' button was pressed, something will happen...

However, my machine cannot find the 'KeyPress' event. Is there something wrong with my codes?

UPDATE:

I also tried putting KeyDown instead of KeyPress:

private void textBox1_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{

    if (e.Key == Key.Return)

        // Enter is pressed - do something
    }
}

Still not working though...

Answer 1

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;
      }
    }
  }