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Posted by / 03-Apr-2015 20:21

Asynchronous updating

Writing asynchronous code has traditionally involved installing a callback (also called continuation) to express the logic that occurs after the asynchronous operation finishes.

This complicates the structure of asynchronous code as compared with synchronous code.

This topic discusses support for asynchronous programming in the . Write Line("Both records are written to database."); } catch (Exception ex) { Console.

Method(Sql Connection conn, Sql Command cmd) { await conn. Execute Non Query Async(); return 1; } public static void Main() { using (Sql Connection conn = new Sql Connection("Data Source=(local); Initial Catalog=North Wind; Integrated Security=SSPI")) { Sql Command command = new Sql Command("select top 2 * from orders", conn); int result = A. The Microsoft Distributed Transaction Controller (MSDTC) must be enabled on the server to use distributed transactions. For information on how to enable MSDTC, see How to Enable MSDTC on a Web Server. When the task finishes, execution resumes in the same method. Format("{0}", reader[0])); } } } Async Callback product List = new Async Callback(Product List); Sql Connection conn = new Sql Connection("…"); conn. Tasks; class A { static void Product List(IAsync Result result) { } public static void Main() { // Async Callback product List = new Async Callback(Product List); // Sql Connection conn = new Sql Connection("Data Source=(local); Initial Catalog=North Wind; Integrated Security=SSPI"); // conn. Tasks; class A { static async Task Perform DBOperations Using Provider Model(string connection String, string provider Name) { Db Provider Factory factory = Db Provider Factories. Command Text = "SELECT * FROM AUTHORS"; using (Db Data Reader reader = await command. Calling an async method does not allocate any additional threads. Open(); Sql Command cmd = new Sql Command("SELECT * FROM [Current Product List]", conn); IAsync Result ia = cmd. Open(); // Sql Command cmd = new Sql Command("select top 2 * from orders", conn); // IAsync Result ia = cmd. Get Factory(provider Name); using (Db Connection connection = factory. Connection String = connection String; await connection. For more information about the asynchronous programming feature that was introduced in . Tasks; class Program { static void Main() { string connection String = "Persist Security Info=False; Integrated Security=SSPI;database=Northwind;server=(local)"; Task task = Execute Sql Transaction(connection String); task. Begin Transaction("Sample Transaction") ); // Must assign both transaction object and connection // to Command object for a pending local transaction command. Execute Non Query Async(); // Attempt to commit the transaction.

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NET Framework 4.5, see: When your user interface is unresponsive or your server does not scale, it is likely that you need your code to be more asynchronous. Wait(); } static async Task Execute Sql Transaction(string connection String) { using (Sql Connection connection = new Sql Connection(connection String)) { await connection. Create Command(); Sql Transaction transaction = null; // Start a local transaction.