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Enabling asynchronous processing through ADO.NET requires that you first add directives to the Microsoft.Data.SqlClient namespace and potentially the System.Threading namespace as well. You will also need to add the Asynchronous Processing=True keyword to your connection string. For example, the following connection string could be used to enable asynchronous processing:
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//C# //Connect to the database and enable asynchronous processing SqlConnection conn = new SqlConnection(); String connStr = @"Data Source=.\SQL2005STD;" + "Initial Catalog=AdventureWorks;" + "Integrated Security=SSPI;" + "Asynchronous Processing=True;";
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Lesson 3: Performing Asynchronous Processing
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conn.ConnectionString = connStr; conn.Open(); 'VB 'Connect to the database and enable asynchronous processing Dim conn As New SqlConnection Dim connStr As String = "Data Source=.\SQL2005STD;" + _ "Initial Catalog=AdventureWorks;" + _ "Integrated Security=SSPI;" + _ "Asynchronous Processing=True;" conn.ConnectionString = connStr conn.Open()
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Once asynchronous processing has been enabled, you can access certain asynchronous methods through the Command object. Each operation includes a Begin and End method. For example, if you want to use ExecuteReader to populate a DataReader object asynchronously, you would use the BeginExecuteReader and EndExecuteReader methods instead. The BeginExecuteReader method will return an IAsynchResult object, which will be used to track the progress of the operation. You can then poll the IsCompleted property to determine when the operation has completed. Once complete, you can call the associated End method. For example, the following code can be used to execute a query asynchronously:
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//C# SqlCommand cmd = new SqlCommand("Select * from Person.Contact", conn); IAsyncResult result = cmd.BeginExecuteReader; while (! result.IsCompleted) { //Perform additional processing } cmd.EndExecuteReader(result); 'VB Dim cmd As New SqlCommand("Select * from Person.contact", conn) Dim result As IAsyncResult = cmd.BeginExecuteReader While Not result.IsCompleted 'Perform additional processing End While cmd.EndExecuteReader(result)
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There are several methods of handling the results of this type of processing. The IAsynchResult object has an AsyncWaitHandle property that enables you to issue a block until the operation completes. Finally, you could use a callback function that executes only when the operation is complete. In some cases, it might be necessary to cancel an executing command. The Command object provides a Cancel method for accomplishing this. In terms of error handling, it is possible you could receive errors on both the Begin and End methods. You might have to make special
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considerations if certain operations are dependent on others, such as rolling back a previous transaction.
Lab: Performing Asynchronous Processing
Lab 3 contains one exercise in which you create a Windows-based application that is used to perform asynchronous processing. The completed code examples, in both Visual Basic and C#, are available in the \Labs\ 04 folder on the companion CD.
IMPORTANT
Lab requirements
You will need to have SQL Server 2005 installed before you can complete this lab. Refer to the Introduction for setup instructions.
Exercise 1: Use the Callback Feature In this exercise, you create a simple Windows application that has one button. The button will perform an asynchronous query using the callback feature. The code in the callback feature will simply return a message box that displays the amount of time the query took to execute. 1. Open Microsoft Visual Studio 2005. 2. If you completed the practice from Lesson 1, skip to step 5. 3. Click File, New, Project. 4. In the New Project dialog box, expand the Other Project Types node, and select Visual Studio Solutions. Type TK4424 for the name of your blank solution, and place it in a directory of your choosing. A new solution file will be created, and you can now add multiple projects to this solution. You will add one project for each lab included in this chapter. 5. Select File, Add, New Project. Select Windows Application as the template, and type Lab3 as the project name. Set the language by selecting Visual Basic or Visual C# from the language drop-down list box. By default, Visual Studio will select the language specified when it was first configured. 6. From the Toolbox, drag one label control onto the Default design surface. Use the following property value for this control:
Name = lblInstance Text = "Server Instance:"
7. From the Toolbox, drag one textbox control onto the Default design surface. Use the following property value for this control:
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