C# 響應KeyDown (| KeyPres | KeyUp)事件

private void tbTest_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
    //判斷按下的鍵是否為Enter鍵
    if(e.KeyValue==Keys.Enter)
    {
        //編寫業務代碼
        MessageBox.Show("You press the enter key");
    }
}