Waiting for an Asynchronous Call with EndInvoke : Async « Thread « VB.Net Tutorial

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VB.Net Tutorial » Thread » Async 
23.11.2.Waiting for an Asynchronous Call with EndInvoke
Imports System
Imports System.Threading
Imports System.Runtime.InteropServices 

    Public Class AsyncDemo 
        Public Function TestMethod(ByVal callDuration As Integer,<Out> ByRef threadId As IntegerAs String
            Console.WriteLine("Test method begins.")
            Thread.Sleep(callDuration)
            threadId = Thread.CurrentThread.ManagedThreadId()
            return String.Format("My call time was {0}.", callDuration.ToString())
        End Function
    End Class
    Public Delegate Function AsyncMethodCaller(ByVal callDuration As Integer,<Out> ByRef threadId As IntegerAs String


    Public Class AsyncMain 
        Shared Sub Main() 

            Dim threadId As Integer
            Dim ad As New AsyncDemo()
            Dim caller As New AsyncMethodCaller(AddressOf ad.TestMethod)

            Dim result As IAsyncResult = caller.BeginInvoke(3000,threadId, Nothing, Nothing)

            Thread.Sleep(0)
            Console.WriteLine(Thread.CurrentThread.ManagedThreadId)

            Dim returnValue As String = caller.EndInvoke(threadId, result)

            Console.WriteLine("The call executed on thread {0}, with return value ""{1}"".", _
                threadId, returnValue)
        End Sub
    End Class
23.11.Async
23.11.1.Waiting for an Asynchronous Call with WaitHandle
23.11.2.Waiting for an Asynchronous Call with EndInvoke
23.11.3.Polling for Asynchronous Call Completion
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