static void Main(string[] args) { //Instantiate var computation = new Computation(); Console.Write("Enter Area : "); var area = Console.ReadLine(); computation.ComputeDeliveryCharge(area); Console.Write("Enter First Name : "); computation.FirstName = Console.ReadLine(); Console.Write("Enter Last Name : "); computation.LastName = Console.ReadLine(); Console.Write("Product Name : "); decimal price = 300.50m; var product = Console.ReadLine(); Console.Write("Quantity : "); int qty = Convert.ToInt32(Console.ReadLine()); var charge = computation.Charge; //Computation var total_amount = (qty * price) + charge; Console.WriteLine(computation.FirstName + " " + computation.LastName + " Ordered " + product + " " + "Total is : " + total_amount); }