... property of the class handles any exceptions, and then writes the output of the CCustomer.ToString method to the RichTextBox. Note In the samples for this chapter, I want to use the same form ... the CCustomer class, and you need to allow its properties to be modified through the text boxes. 22. First, add a form-level variable called mCustomer of type CCustomer to the form. Use the ... properties. The place to start is with the properties of your class. You& apos;ll also need to create some code to test your class, so you& apos;ll need to create a form that interacts with the instances...