昨天弄了一下午，總是提示激發了未處理的事件“PageIndexChanging“

修改方法：一要在girdview 后面加 OnPageIndexChanging="GridView1_PageIndexChanging，

二要cs頁面中添加

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
                 GridView1.PageIndex = e.NewPageIndex;
                 DataBind();
         }

OK問題解決！！

下面的是一個比較齊全的分頁代碼， 

protected void Page_Load(object sender, EventArgs e)
       {
            btnFirst.Text = "最首頁";
            btnPrev.Text = "前一頁";
            btnNext.Text = "下一頁";
            btnLast.Text = "最后頁";
            GridView1.DataBind();
            ShowPageChangedStatus();
       }

private void ShowPageChangedStatus()
        {
            lblCurrentIndex.Text = "第" + (GridView1.PageIndex + 1).ToString() + "頁";
            lblPageCount.Text = "總共 " + GridView1.PageCount.ToString() + " 頁";
        }

public void PagerButtonClick(object sender, EventArgs e)
        {
            string arg = ((LinkButton)sender).CommandArgument.ToString();
            switch (arg)
            {
                case "next":
                    if (GridView1.PageIndex < (GridView1.PageCount - 1))
                    {
                        GridView1.PageIndex += 1;
                    }
                    break;
                case "prev":
                    if (GridView1.PageIndex > 0)
                    {
                        GridView1.PageIndex -= 1;
                    }
                    break;
                case "last":
                    GridView1.PageIndex = (GridView1.PageCount - 1);
                    break;
                default:
                    GridView1.PageIndex = System.Convert.ToInt32(arg);
                    break;
            }
            GridView1.DataBind();
            ShowPageChangedStatus();
        }

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            int startIndex;
            startIndex = GridView1.PageIndex * GridView1.PageSize;
            GridView1.PageIndex = e.NewPageIndex;
            GridView1.DataBind();
            ShowPageChangedStatus();
        } 

  <asp:label id="lblPageCount" runat="server"></asp:label> 
  <asp:label id="lblCurrentIndex" runat="server"></asp:label>
  <asp:linkbutton id="btnFirst" onclick="PagerButtonClick" runat="server"
   Font-size="8pt" ForeColor="navy" CommandArgument="0"></asp:linkbutton> 
  <asp:linkbutton id="btnPrev" onclick="PagerButtonClick" runat="server"
   Font-size="8pt" ForeColor="navy" CommandArgument="prev"></asp:linkbutton> 
  <asp:linkbutton id="btnNext" onclick="PagerButtonClick" runat="server"
   Font-size="8pt" ForeColor="navy" CommandArgument="next"></asp:linkbutton> 
  <asp:linkbutton id="btnLast" onclick="PagerButtonClick" runat="server"
   Font-size="8pt" ForeColor="navy" CommandArgument="last"></asp:linkbutton>