[الطالب]

سلام

كود :

Imports System.Threading

Public Class Form1

    Dim m As Integer = 0

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Not BackgroundWorker1.IsBusy Then BackgroundWorker1.RunWorkerAsync()

    End Sub

    Private Delegate Sub Control()

    Private Sub BackgroundWorker1_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Do
            Dim Invoker As New Control(Sub()
                                           TextBox1.Text = m
                                       End Sub)
            TextBox1.Invoke(Invoker, Nothing)
            m = m + 5
            Thread.Sleep(1000)
        Loop
    End Sub

End Class

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