//按回車等同於按“Tab”
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) 

{ 
     if(e.KeyChar == (char)13) 
     { 
         SendKeys.Send("{Tab}"); 
  } 
}
//按回車等同於點選按鈕
if (e.KeyChar.Equals('\r'))
	{
		button1.PerformClick();
}

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