Write program in C#.

Create a prototype of an e-commerce application.

Create objects for Customer, Product, Line Item and Order. Create unit tests for each attribute and method.

======================== Customer ====================================== Properties/Attributes: First Name Last Name Email Phone Address

======================== Order ========================================= Initialization: Initialize the Order class with the Customer object.

Properties/Attributes: ID Date Placed Date Filled Invoice Customer Array of line items (LineItem has a Product and Quantity) OrderStatus {Open,Filled, Cancelled} PaymentStatus{Unpaid,Paid}

Methods Get Subtotal (each line item's product list price * quantity) Get Tax (use 7.77%) Get Grand Total Add Line Item Remove Line Item Update Quantity

======================== Product ====================================== Properties/Attributes: ID Name Description Color ListPrice Weight Height

======================= LineItem ====================================== Initialization: Initialize with the Product ID and quantity

Properties/Attributes: ID ProductId Quantity

Methods Get Quantity

Each object should have a ToString() and Equals() method.