Write a C# program that inputs a promotional code and checks if it is valid.

Your program should work as follows:

• Input a promotional code from the user and store it in a suitable variable.
• If the promotional code entered is equal to SAVE20, display the message Discount applied.
• If the promotional code entered is not equal to SAVE20, display the message Invalid code.

You should use meaningful variable name(s), correct syntax, and indentation in your answer.