For C#

I need a step by step help on how to write the code please!

Scenario: Create a Windows Forms application that accepts the total cost of a sale and the amount submitted by the customer.

Calculate and display the correct change from largest denomination to smallest.

If the cost exceeds the amount submitted, post a message to the user that they have entered an invalid amount.

The program should accept both the cost and the amount submitted into textbox controls.

The program should use Try/Catch statements to keep the program from crashing.

Inputs:

1. The cost of a sale.

2. The amount submitted to pay for the sale.

Processing:

1. Calculate the correct change due to the buyer.

2. Display the correct change from largest bill to smallest coin.

Output:

Display a graphical representation of the bills/coins and the correct amounts of each.

Hint: You will need to use the modulus operator to determine the remaining amount after extracting the correct number of bills/coins from the previous amount