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The client application may need to display a complete list of items selected by a user in their shopping cart. This is accomplished with the help of the GetCart() web method, shown in Listing B-7. Listing B-7. Retrieving Shopping Cart Items [WebMethod] public DataSet GetCart(string cartid) { string sql = "SELECT * FROM shoppingcart c,products p WHERE c.productid=p.id AND c.cartid=@cartid"; SqlParameter[] p = new SqlParameter[1]; p[0] = new SqlParameter("@cartid", cartid); DataSet ds = SqlHelper.GetDataSet(sql, p); return ds; } The GetCart() web method accepts the shopping cart identifier and returns all the items from that cart to the caller in the form of a DataSet. Notice that the SELECT query is based on two tables ShoppingCart and Products because the product name and unit price also need to be sent back to the client application.

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Often shopping cart web pages need to display the total amount of the cart. This is achieved by a web method named GetCartAmount(), shown in Listing B-8. Listing B-8. Retrieving the Cart Amount [WebMethod] public decimal GetCartAmount(string cartid) { string sql1 = "SELECT SUM(c.Qty * p.UnitPrice) AS Total FROM Products AS p INNER JOIN ShoppingCart AS c ON p.Id = c.ProductID WHERE c.CartID = @cartid"; SqlParameter[] p1 = new SqlParameter[1]; p1[0] = new SqlParameter("@cartid", cartid); object obj = SqlHelper.ExecuteScalar(sql1, p1); if (obj != DBNull.Value) { decimal amount = (decimal)obj; return amount; } else { return 0; } } The GetCartAmount() web method accepts a unique cart identifier and returns the total amount for that cart. Inside it executes a SUM() aggregate query. If the query returns NULL, a value of 0 is returned to the caller. Otherwise, the actual cart total is returned as a decimal value.

Your network probably has a lot of computers that need an IP address and other IP-related information in their configuration. You can, of course, enter all this information by hand on each individual workstation, but it s much easier to automate this process with a dynamic host configuration protocol (DHCP) server. Let s see how to set this up on Ubuntu Server.

Note that by creating the object in a using statement, it is automatically freed when the statement ends Another point to remember is that the args argument on the Main function receives the command-line parameters used when calling the game If you wish to include command-line arguments in your game such as special cheat codes for helping you test the game this is where you need to deal with them The Game1 class is implemented in the Game1cs file A quick look at the Game1 class reveals that it s derived from the MicrosoftXnaFrameworkGame class, the base class offered by XNA that encapsulates window creation, graphics, audio and input initialization, and the basic game logic we already talked about..

DHCP is a broadcast-based protocol A client that s configured to obtain an IP address via DHCP sends a broadcast on startup to try to find one or more DHCP servers in the network The client uses the DHCPDISCOVER packet to do this If a DHCP server sees the DHCPDISCOVER packet coming by, it answers with a DHCPOFFER packet, in which it offers an IP address and related information If the client receives a DHCPOFFER from more than one DHCP server, it chooses only one It s very difficult to determine beforehand what IP configuration information the client will work with, which is one of the reasons why you should take care that no more than one DHCP server is available per broadcast domain to offer a configuration to the DHCP clients.

When an order is placed, the Orders table should have an entry for that order. Moreover, all the items from the shopping cart must be moved to the OrderDetails table. This is accomplished with the help of the PlaceOrder() web method, shown in Listing B-9. Listing B-9. Placing an Order [WebMethod] public int PlaceOrder(string cartid,string street,string city,string state, string country,string postalcode) { string sql1 = "SELECT SUM(c.Qty * p.UnitPrice) AS Total FROM Products AS p INNER JOIN ShoppingCart AS c ON p.Id = c.ProductID WHERE c.CartID = @cartid";

Sending and receiving messages is simply a matter of calling the SendData and ReceiveData methods of the LocalNetworkGamer class, which represents a local player. Both methods can handle arrays of bytes or a packet writer, which is a binary data streamer. A packet writer receives basic data types and transforms them into an array of bytes in an efficient

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