e.Item.FindControl("DropdownId") Returning Null

Hi Group,

I have a datagrid with dropdown in my application.
I want to fill the data in dropdown by an ArrayList
for that I am using "e.Item.FindControl("DropdownId")"
but this function is returning NULL THUS I m getting exception
"Object Refrence not set to an Instance to Object",

Here is the code I wrote (ASP.NET 1.1)...

Hope I get some help from you,

///Cdoe Behind

  private void dataGrid1_ItemDataBound(object sender, DataGridItemEventArgs e)
  {

   if(e.Item.ItemType == ListItemType.Footer)
   {
    
    
    
    System.Web.UI.WebControls.DropDownList drp = new     DropDownList();
    drp = (DropDownList)e.Item.FindControl("listAnup");
    drp.DataSource=newArrayList;//This Statement throwing exception
    drp.DataBind();
   }
  
  }

///aspx code

    
    
    
    
    
    
    
    
    
     
      
       
      
     
     
      
       
      
     
    
    
         Mode="NumericPages">
         BackColor="#D8D8DA" PageButtonCount="15" Mode="NumericPages">
    
        HorizontalAlign="Center" Position="TopAndBottom" BackColor="#D8D8DA"
    PageButtonCount="15" CssClass="dgridPaging"
    Mode="NumericPages">