Page Load Fires Multiple Times

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ASP.NET2

Hi All,
Page Load Event occur multiple times more than once in my application even afetr !page.Ispostback was checked...The below is my code for reference..Kindly find any solution..

if (!Page.IsPostBack)
       {
           ddlYears.SelectedIndex = 0;
           int yearname = Convert.ToInt32(DateTime.Now.Year);
           int intloop;
           int minus = yearname - 2;

           for (intloop = minus; intloop <= yearname; intloop++)
           {
               ddlYears.Items.Add(new ListItem(intloop.ToString()));
           }

}