ListView + DataPager + QueryStringField

protected void Page_Load(object sender, EventArgs e)
{
  //page EnableViewState="true"
  if(!IsPostBack) BindData();

  //page EnableViewState="false"
  //BindData();
}

private void BindData()
{
  int page;
  if(!int.TryParse(Request.QueryString[pager.QueryStringField], out page)) page = 1;
  
  pager.SetPageProperties((page - 1) * pager.PageSize, pager.PageSize, false);

  items.DataSource = _items;
  items.DataBind();
}