$4-$ Write a program for a restaurant. Have a menu of Food, Drinks and Desserts. Offer a variety of options and find the amount the customer has to pay based on the choices they make. You should use while and if$-$else in the program. You can design and write the program as you wish $(30$ Points$).$

$5-$ Write a simple product inventory tracking program for a grocery store. Write the name of the products sold, the number of units purchased, and reduces the number in stock when sold. You can design the program the way you want $(30$ points$).$

Write both of them in C# please!