asp.net dynamically button with event handler

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You must have to place that code in page_load or page_init event. 

protected void Page_Load()
{
  Button ButtonChange = new Button();

  ButtonChange.Text = "Change";
  ButtonChange.ID = "change_" + i.ToString();
  ButtonChange.Font.Size = FontUnit.Point(7);
  ButtonChange.ControlStyle.CssClass = "button";
  ButtonChange.Click += new EventHandler(test);
}

Read MSDN article – How to: Add Controls to an ASP.NET Web Page Programmatically?

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