Detecting Key Presses

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TextBox tb = new TextBox();

// Assign a new event handler
tb.KeyDown += new KeyEventHandler(tb_KeyDown);

// The event handler
private void tb_KeyDown(object sender, KeyEventArgs e) {
    if (e.KeyCode == Keys.Enter) {
        //Enter key is down

        //Capture the text
        if (sender is TextBox) {
            TextBox txb = (TextBox)sender;
            MessageBox.Show(txb.Text);
        }
    }
}

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TextBox tb = new TextBox();

// Assign a new event handler
tb.KeyDown += new KeyEventHandler(tb_KeyDown);

private void tb_KeyDown(object sender, KeyEventArgs e) {
    if (e.Key == Key.Enter) {
        e.Handled = true;
        MessageBox.Show("You pressed Enter!");
    }
}