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//Updating UI controls from worker thread
void WorkerThreadMethod()
{
    //Using Action delegate
    Action actionDelegate = () => label1.Text = "Hello from Worker Thread";
    Action actionDelegate1 = delegate() { label1.Text = "Hello from Worker Thread"; };
    this.Invoke(actionDelegate);

    //Using Func delegate
    System.Func<int> funcDelegate = () => { label1.Text = "Hello from Worker Thread"; return 5; };
    System.Func<int> funcDelegate1 = delegate() { label1.Text = "Hello from Worker Thread"; return 5; };
    this.Invoke(funcDelegate1);

    //Using MethodInvoker delegate
    MethodInvoker methodInvokerDelegate = delegate() { label1.Text = "Hello from Worker Thread"; };
    MethodInvoker methodInvokerDelegate1 = () => { label1.Text = "Hello from Worker Thread"; };
    this.Invoke(methodInvokerDelegate);

    //WPF
    Dispatcher.Invoke(action);

    //WinForms
    this.Invoke(methodInvokerDelegate);
}

private void workerThreadButton_Click(object sender, EventArgs e)
{
    new Thread(WorkerThreadMethod).Start();
}