asp.net listview 实现分页浏览效果

页面代码：

 <div style="margin-top:0px;">共<asp:Label ID="lb_count" runat="server" Text ="Label"></asp:Label>条记录
                      共<asp:Label ID="lb_page" runat="server" Text="Label"></asp:Label>页&nbsp;
                      当前第<asp:Label ID="lb_CurrentPage" runat="server" Text=""></asp:Label>页
                     <br />
                      <asp:LinkButton ID="LinkFirst" runat="server" OnClick="LinkFirst_Click"> 第一页
                      </asp:LinkButton>
                      <asp:LinkButton ID="LinkUp" runat="server" OnClick="LinkUp_Click"> 上一页
                      </asp:LinkButton>
                      <asp:LinkButton ID="LinkDown" runat="server" OnClick="LinkDown_Click"> 下一页
                      </asp:LinkButton>
                      <asp:LinkButton ID="LinkLast" runat="server" OnClick="LinkLast_Click"> 最后一页
                      </asp:LinkButton>转到第<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True">
                      </asp:DropDownList>页</div>

后台代码：

protected SqlDataAdapter da;
protected DataSet ds;
private void getArticle() //取得Article 数据
        {
            string connectionString = "Server=.;database=Flower;uid=sa;pwd=zhuwenfan";
            SqlConnection myconn = new SqlConnection(connectionString);//取连接字符串,建立连接
            da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand("select * from FLOWERS_ORDER order by O_ID desc", myconn);
            ds = new DataSet();

            try
            {
                myconn.Open();
                da.Fill(ds, "Article");
                myconn.Close();
            }
            catch (SqlException e1)
            {
                Response.Write(e1.ToString());
            }
            int cup = Convert.ToInt32(this.lb_CurrentPage.Text); //当前页数,初始化为地1 页
            PagedDataSource ps = new PagedDataSource();
            ps.DataSource = ds.Tables["Article"].DefaultView;
            ps.AllowPaging = true;
            ps.PageSize = ; //每页显示的数据的行数
            ps.CurrentPageIndex = cup - ;
            lb_count.Text = ps.DataSourceCount.ToString(); //获取记录总数
            lb_page.Text = ps.PageCount.ToString(); //获取总页数
            if (!IsPostBack)
            {
                for (int i = ; i < ps.PageCount + ; i++)
                {
                    this.DropDownList1.Items.Add(i.ToString());
                }
                LinkUp.Enabled = true;
                LinkDown.Enabled = true;
            }
            try
            {
                DropDownList1.SelectedItem.Text = cup.ToString();
                ListView1.DataSource = ps;
                ListView1.DataBind();
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }
        protected void LinkDown_Click(object sender, EventArgs e) //下一页按钮代码
        {
            try
            {
                lb_CurrentPage.Text = Convert.ToString(Convert.ToInt32(lb_CurrentPage.Text) + );
                DropDownList1.SelectedValue = lb_CurrentPage.Text;
                getArticle();
            }
            catch
            {
                Response.Write("<script language=javascript>" + "alert(\"已经是最后一页\")" + "</script>");
                lb_CurrentPage.Text = "";
                getArticle();

            }
        }
        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) //跳转到指定页代码
        {
            int page = Convert.ToInt16((DropDownList1.SelectedItem.Value));
            lb_CurrentPage.Text = page.ToString();
            getArticle();
        }
        protected void LinkUp_Click(object sender, EventArgs e) //上一页按钮代码
        {
            try
            {
                if (Convert.ToInt16(lb_CurrentPage.Text) > )
                {
                    lb_CurrentPage.Text =
                    Convert.ToString(Convert.ToInt32(lb_CurrentPage.Text) - );
                    DropDownList1.SelectedValue = lb_CurrentPage.Text;
                    getArticle();
                }
                else
                {
                    Response.Write("<script>alert('已经是第一页');location.replace(location.href);</script>");
                }
            }
            catch
            {
                Response.Write("<script>alert('已经是第一页');location.replace(location.href);</script>");
            }
        }
        protected void LinkFirst_Click(object sender, EventArgs e) //跳到第一页代码
        {
            if (lb_CurrentPage.Text != "")
            {
                lb_CurrentPage.Text = "";
            }
            else
            {
                Response.Write("<script language=javascript>" + "alert(\" 已经是第一页\")" + "</script>");
            }
            getArticle();
        }
        protected void LinkLast_Click(object sender, EventArgs e) //跳到最后一页代码
        {
            if (lb_CurrentPage.Text.ToString() != lb_page.Text.ToString())
            {
                lb_CurrentPage.Text = lb_page.Text.ToString();
            }
            else
            {
                Response.Write("<script language=javascript>" + "alert(\"已经是最后一页\")" + "</script>");
            }
            getArticle();
        }