Explain how to add functionality to a Button on a Form.

What will be an ideal response?

Adding functionality to a Button is easy when you use the IDE. After you have dragged a Button onto a Form, you can double-click it to create a method that executes when the user clicks the button. As you create GUI applications, you will frequently switch back and forth between the visual environment and the code. You can use the tabs or shortcut keys, or click View on the main menu and then click Code or Designer for the desired view.
If you scroll through the exposed code, you will see many generated statements, some of which are confusing. However, to make a Button perform an action, you can ignore most of the statements. You only need to write code between the curly braces of the method with the following header:
private void button1_Click(object sender, EventArgs e)
You can write any statements between the curly braces of the button1_Click() method. For example, you can declare variables, perform arithmetic statements, and produce output.