? cant add items to my DropdownList

? cant add items to my DropdownList[10]; 
int sayi = 0;
        string filtre = "";
        
        DropDownList[] ddllist=new DropDownList[10];
        foreach (DataListItem di in dlFiltre.Items)
        {
          
            DropDownList ddl = (DropDownList)di.FindControl("ddlFiltre");
            if (ddl.SelectedValue != "0")
            {
                string a = ddl.SelectedItem.ToString();
     &nbs ...