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As of .NET 2.0, the SQL data provider (represented by the System.Data.SqlClient namespace) has been enhanced to support asynchronous database interactions via the following new members of SqlCommand: BeginExecuteReader()/EndExecuteReader() BeginExecuteNonQuery()/EndExecuteNonQuery() BeginExecuteXmlReader()/EndExecuteXmlReader() Given your work in 14, the naming convention of these method pairs may ring a bell. Recall that the .NET asynchronous delegate pattern makes use of a begin method to execute a task on a secondary thread, whereas the end method can be used to obtain the result of the asynchronous invocation using the members of IAsyncResult and the optional AsyncCallback delegate. Because the process of working with asynchronous commands is modeled after the standard delegate patterns, a simple example should suffice (so be sure to consult 14 for full details of asynchronous delegates). Assume you wish to select the records from the Inventory table on a secondary thread of execution using a data reader object. Here is the complete Main() method, with analysis to follow: static void Main(string[] args) { Console.WriteLine("***** Fun with ASNYC Data Readers *****\n"); // Create an open a connection that is async-aware. SqlConnection cn = new SqlConnection(); cn.ConnectionString = "uid=sa;pwd=;Initial Catalog=Cars;" + "Asynchronous Processing=true;Data Source=(local)"; cn.Open(); // Create a SQL command object that waits for approx 2 seconds. string strSQL = "WaitFor Delay '00:00:02';Select * From Inventory"; SqlCommand myCommand = new SqlCommand(strSQL, cn); // Execute the reader on a second thread. IAsyncResult itfAsynch; itfAsynch = myCommand.BeginExecuteReader(CommandBehavior.CloseConnection); // Do something while other thread works. while (!itfAsynch.IsCompleted) { Console.WriteLine("Working on main thread..."); Thread.Sleep(1000); } Console.WriteLine(); // All done! Get reader and loop over results. SqlDataReader myDataReader = myCommand.EndExecuteReader(itfAsynch); while (myDataReader.Read()) { Console.WriteLine("-> Make: {0}, PetName: {1}, Color: {2}.", myDataReader["Make"].ToString().Trim(), myDataReader["PetName"].ToString().Trim(), myDataReader["Color"].ToString().Trim());

} myDataReader.Close(); } The first point of interest is the fact that you need to enable asynchronous activity using the new Asynchronous Processing segment of the connection string. Also note that you have padded into the command text of your SqlCommand object a new WaitFor Delay segment simply to simulate a long-running database interaction. Beyond these points, notice that the call to BeginExecuteDataReader() returns the expected IasyncResult-compatible type, which is used to synchronize the calling thread (via the IsCompleted property) as well as obtain the SqlDataReader once the query has finished executing.

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As you have seen, working with the connected layer allows you to interact with a database using connection, command, and data reader objects. With this small handful of types, you are able to select, insert, update, and delete records to your heart s content (as well as trigger stored procedures). In reality, however, you have seen only half of the ADO.NET story. Recall that the ADO.NET object model can be used in a disconnected manner. When you work with the disconnected layer of ADO.NET, you will still make use of connection and command objects. In addition, you will leverage a specific object named a data adapter (which extends the abstract DbDataAdapter) to fetch and update data. Unlike the connected layer, data obtained via a data adapter is not processed using data reader objects. Rather, data adapter objects make use of DataSet objects to move data between the caller and data source. The DataSet type is a container for any number of DataTable objects, each of which contains a collection of DataRow and DataColumn objects. The data adapter object of your data provider handles the database connection automatically. In an attempt to increase scalability, data adapters keep the connection open for the shortest possible amount of time. Once the caller receives the DataSet object, he is completely disconnected from the DBMS and left with a local copy of the remote data. The caller is free to insert, delete, or update rows from a given DataTable, but the physical database is not updated until the caller explicitly passes the DataSet to the data adapter for updating. In a nutshell, DataSets allow the clients to pretend they are indeed always connected, when in fact they are operating on an in-memory database (see Figure 22-10).

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C# is a case-sensitive programming language. Therefore, Main is not the same as main , and Readline is not the same as ReadLine . Given this, be aware that all C# keywords are in lowercase ( public, lock, global, and so on), while namespaces, types, and member names begin (by convention) with an initial capital letter and have capitalized any embedded words (e.g., Console.WriteLine, System.Windows.Forms.MessageBox, System.Data.SqlClient, and so on).

Since some of the employee information we are collecting will be passed on to other departments for processing, we ll place the data from each screen in its own class. We re also going to

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