I want to generate a random number sequence but ...

Question

I want to generate a random number sequence but ..  I want to be able to change sequence numbers count .

Also I don't need to show something I tryed to find a way to get over comboBox but I failed :( 

Any advise ?? :) 

 

I found something like this it doesn't work  :((  ;

private void button1_Click(object sender, EventArgs e)
{
   for (int i = 0; i < 4; i++)
  {
     comboBox1.Items.Add(i.ToString("D2"));
  }
}