I am not sure why you are unable to make it work.
Just follow the steps
1. Add a new C# windows application project
2. Add couple of buttons and one text box to the forum
3. Add the following code to the event handlers of the buttons
private void button1_Click(object sender, EventArgs e)
textBox1.Text = "Updated in the clicked event";
private void button2_Click(object sender, EventArgs e)
x x1 = new x(test);
public delegate void x();
public void test()
for (int i = 0; i <= 1000000000; i++)
It should do the job for you.