--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HowTo/Aspects/AsyncAspect.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,83 @@
+using System;
+using System.Threading;
+
+using NUnit.Framework;
+
+using BLToolkit.Aspects;
+using BLToolkit.Reflection;
+
+namespace HowTo.Aspects
+{
+	public /*[a]*/abstract/*[/a]*/ class AsyncTestObject
+	{
+		// This is a member we will call asynchronously.
+		//
+		public /*[a]*/int/*[/a]*/ /*[a]*/Test/*[/a]*/(/*[a]*/int intVal, string strVal/*[/a]*/)
+		{
+			Thread.Sleep(200);
+			return intVal;
+		}
+
+		// Begin async method should take the same parameter list as the Test method and return IAsyncResult.
+		// Two additional parameters can be provided: AsyncCallback and state object.
+		// 'Begin' prefix is a part of the default naming convention.
+		//
+		[/*[a]*/Async/*[/a]*/] public abstract /*[a]*/IAsyncResult/*[/a]*/ /*[a]*/BeginTest/*[/a]*/(/*[a]*/int intVal, string strVal/*[/a]*/);
+		[/*[a]*/Async/*[/a]*/] public abstract /*[a]*/IAsyncResult/*[/a]*/ /*[a]*/BeginTest/*[/a]*/(/*[a]*/int intVal, string strVal/*[/a]*/, /*[a]*/AsyncCallback/*[/a]*/ callback);
+		[/*[a]*/Async/*[/a]*/] public abstract /*[a]*/IAsyncResult/*[/a]*/ /*[a]*/BeginTest/*[/a]*/(/*[a]*/int intVal, string strVal/*[/a]*/, /*[a]*/AsyncCallback/*[/a]*/ callback, /*[a]*/object/*[/a]*/ state);
+
+		// End async method should take IAsyncResult and return the same type as the Test method.
+		// 'End' prefix is a part of the default naming convention.
+		//
+		[/*[a]*/Async/*[/a]*/] public abstract /*[a]*/int/*[/a]*/          /*[a]*/EndTest/*[/a]*/  (/*[a]*/IAsyncResult/*[/a]*/ asyncResult);
+
+		// Begin/End naming convention is not required. You can use any name 
+		// if you provide the target method name as a parameter of the Async attribute.
+		//
+		[/*[a]*/Async/*[/a]*/("Test")]
+		public abstract /*[a]*/IAsyncResult/*[/a]*/ AnyName(/*[a]*/int intVal/*[/a]*/, /*[a]*/string strVal/*[/a]*/, /*[a]*/AsyncCallback/*[/a]*/ callback, /*[a]*/object/*[/a]*/ state);
+
+		// Here we provide the parameter list along with the method name.
+		//
+		[/*[a]*/Async/*[/a]*/("Test", typeof(int), typeof(string))]
+		public abstract /*[a]*/int/*[/a]*/         AnyName(/*[a]*/IAsyncResult/*[/a]*/ asyncResult);
+	}
+
+	[TestFixture]
+	public class AsyncAspectTest
+	{
+		[Test]
+		public void AsyncTest()
+		{
+			AsyncTestObject o = /*[a]*/TypeAccessor/*[/a]*/<AsyncTestObject>.CreateInstance();
+
+			IAsyncResult ar = o./*[a]*/BeginTest/*[/a]*/(1, "10");
+			Assert.AreEqual(1, o./*[a]*/EndTest/*[/a]*/(ar));
+		}
+
+		private static void /*[a]*/CallBack/*[/a]*/(IAsyncResult ar)
+		{
+			Console.WriteLine("Callback");
+
+			AsyncTestObject o = (AsyncTestObject)ar.AsyncState;
+			o.EndTest(ar);
+		}
+
+		[Test]
+		public void CallbackTest()
+		{
+			AsyncTestObject o = TypeAccessor<AsyncTestObject>.CreateInstance();
+
+			o.BeginTest(2, null, /*[a]*/CallBack/*[/a]*/, /*[a]*/o/*[/a]*/);
+		}
+
+		[Test]
+		public void AnyNameTest()
+		{
+			AsyncTestObject o = TypeAccessor<AsyncTestObject>.CreateInstance();
+
+			IAsyncResult ar = o./*[a]*/AnyName/*[/a]*/(2, null, null, null);
+			Assert.AreEqual(2, o./*[a]*/AnyName/*[/a]*/(ar));
+		}
+	}
+}