How to Cross-thread operation

The same control can't be accessed by multiple threads. in that case the following code is helpful

private void Form1_Load(object sender, EventArgs e)

{

    Thread t1 = new Thread(new ParameterizedThreadStart(printThr1));

    Thread t2 = new Thread(printThr2);

    t1.Start("U");

    t2.Start();

}

private void printThr1(object t)

{

           

    for(int i=1;i<600000;i+=2)

    {

        if (txtControl.InvokeRequired)

        {

            txtControl.Invoke(new MethodInvoker(delegate { txtControl.Text += Environment.NewLine + t.ToString()+"= " + i; }));

            Thread.Sleep(500);

        }

    }

}

private void printThr2()

{

           

    for (int i = 0; i < 50000; i += 2)

    {

              

        if (txtControl.InvokeRequired)

        {

            txtControl.Invoke(new MethodInvoker(delegate { txtControl.Text += Environment.NewLine + "N= " + i; }));

            Thread.Sleep(300);

        }

    }

}