mark label and textbox

Change the color of the label and textbox on click of the Label as well as Textbox as below
Below code will work
 
private void label2_Click(object sender, EventArgs e)
{
label2.BackColor = Color.Red;
textBox1.BackColor = Color.Red;
}
private void textBox1_Click(object sender, EventArgs e)
{
label2.BackColor = Color.Red;
textBox1.BackColor = Color.Red;
}

I am developing windows application.
 
Any idea how this change can be done instantly at the same time even I click on label or textbox?

Which application you are developing - Web Application or Windows Application ?
If its web application, you can go for Javascript. Its so simple to use javascript and avoids the unnecessary refresh of the page, i mean it avoids the postback.
If its windows application you can directly write the code in C#.

Its so simple.
Just write a OnClick event in javascript for the Label as well as TextBox.
Change the background color of the in which the label and textbox are present.
Change to default color in OnBlur event of the

Mark Together means, in what sense you are telling.
You mean to say put a border line for the label and text box ?