answer using C# 1. Product class, that maintains the following information: 2. Inventory class, that uses a Dictionary t

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answer using C#
1. Product class, that maintains the following information:
2. Inventory class, that uses a Dictionary to implement thefollowing operations (use product Code as the key, Product objectas the value):
3. InvoiceItem class. For each InvoiceItem in the invoice, ithas the following:
4. Invoice class that uses a HashSet that holdsInvoiceItems. Implement the following operations for the Invoice orBill of Sale:
5. Do the following in the main method:
a) Create an Inventory object
b) Add 5 instances of Product objects to the Inventoryobject.
c) Print all products in the Inventory
d) Create an Invoice
e) Create 3 instances of InvoiceItem using 3 instances ofProduct from the inventory retrieved by the Product Code.
f) Add the above 3 InvoiceItem to the Invoice. Test if youcan add the same product twice as a part of two separateInvoiceItem. The application should not allow this.
g) Print the invoice, showing the subtotal and grandtotal.