protected void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
   ViewState["Page"] = 0;
   Bangding();
  }
}
//綁定數據
public void Bangding()
{
  PagedDataSource pds = new PagedDataSource();
  pds.DataSource = MerchandiseManager.GetList("");
  pds.AllowPaging = true;
  pds.PageSize = 5; //每頁記錄數
  pds.CurrentPageIndex = Pager;//當前頁
  lblCurrPage.Text = "第" + (pds.CurrentPageIndex + 1).ToString() + "頁 共" + pds.PageCount.ToString() + "頁";
  SetEnable(pds);//上下頁按鈕的有效壯態
  dlistMerchand.DataSource = pds;
  dlistMerchand.DataBind();
}
private int Pager
{
  get
  {
   return (int)ViewState["Page"];
  }
  set
  {
   ViewState["Page"] = value;
  }
}
//下一頁
protected void LinkButton1_Click(object sender, EventArgs e)
{
  Pager++;
  Bangding();
}
//上一頁
protected void LinkButton2_Click(object sender, EventArgs e)
{
  Pager--;
  Bangding();
}
//上下頁按鈕的有效壯態
private void SetEnable(PagedDataSource pds)
{
  btnShang.Enabled = true;
  btnXia.Enabled = true;
  if (pds.IsFirstPage)
  {
   btnShang.Enabled = false;
  }
  if (pds.IsLastPage)
  {
   btnXia.Enabled = false;
  }
}