What are TextBoxes and how do you use them?

What will be an ideal response?

TextBoxes are controls through which a user can enter input data in a GUI application. If a user will enter data in a TextBox, you frequently want to start with its Text property empty, but you are allowed to add text to its Text property if desired.
When a user types a value into a TextBox in an executing program, it becomes the value for the Text property of the TextBox. Because a user might type any value, the value in a TextBox is a string by default. When you write an application in which the user is supposed to enter a number, you must convert the entered string into a number. You are familiar with this process because it's exactly the same action you must take when a user enters data in response to a ReadLine() statement in a console application.