key down in .net

private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.ControlKey)
        {
            //Do some work
        }
    }

Private  Sub textBox1_KeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
            If e.KeyCode = Keys.ControlKey Then
                'Do some work'
            End If
       End Sub