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highlights the stuff you are more likely to use. For a deep-dive into all methods, properties, enumerations, and so forth for each and every class, see the SDK reference material.

Figure 5-1. A byte with a value of 10 A bit can be set to a one or a zero. You can see the eight bits in Figure 5-1 they are the boxes with the zeros and ones in them. Starting with the rightmost bit, each is assigned a value, known as its worth. You can see the worth above each bit in Figure 5-1, starting at 1, then 2, 4, 8, and so on. To store a value, we set some of the bits to 1 and then add up the worth of those bits to get the value, ignoring those that are set to 0. In the figure, you can see that the second and fourth and eighth bits from the right are set to 1 and that these have a worth of 2, 8, and 128, respectively. The byte that is demonstrated by Figure 5-1 represents a value of 138 (2, 8, and 128 added together). We can view the binary representation of a numeric type by using the Convert.ToString method, which takes a numeric type and a base; we use a base of 2 since we want to display binary. Listing 5-19 provides a demonstration.

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Note Unlike C and C++, numeric values do not have a Boolean interpretation in C#.

class Listing 13 { static void Main(string[] args) { // get the connection string from the config file ConnectionStringSettings connStringSettings = ConfigurationManager.ConnectionStrings["NorthwindConnection"]; // create the connection object SqlConnection myConnection = new SqlConnection(connStringSettings.ConnectionString); // create the SqlDataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter( "SELECT * FROM Employees", myConnection); // create the command builder SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter); // create the DataSet object DataSet myDataSet = new DataSet(); // fill the dataset into the named table myAdapter.Fill(myDataSet, "Employees"); // query the DataSet using LINQ IEnumerable<DataRow> results = from row in myDataSet.Tables["Employees"].AsEnumerable() where row.Field<string>("LastName") == "Freeman" select row; // enumerate through the results and delete the rows foreach (DataRow row in results) { row.Delete(); } // update the database

To allow for a more efficient transfer of data and classes between web applications and web services, ASP.NET AJAX supports the JavaScript Object Notation (JSON) format. It is lighter weight than XML (Extensible Markup Language)/SOAP (Simple Object Access Protocol), and delivers a more consistent experience because of the implementation differences of XML/SOAP by the various browsers. JSON is a text-based data-interchange format that represents data as a set of ordered name/value pairs. As an example, take a look at the following class definition, which stores a person s name and age:

Listing 26-8 provides a demonstration of using both forms of the Beep method. Listing 26-8. Making the Console Beep using System; class Listing 08 { static void Main(string[] args) { Console.Beep(); Console.Beep(850, 200); Console.Beep(900, 200); Console.Beep(950, 200); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }

workflow participants. The host provides common mechanisms for all WF workflows to provide core services.