我的留言板运行时显示不了啊 ！！！
我在做一个博客系统，运行的时候查看留言的时候显示不出来是怎么回事啊？？？

代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

public partial class Default2 : System.Web.UI.Page
{
  public string ShowSubject, ShowTime, ShowContent;

  protected void Page_Load(object sender, EventArgs e)
  {

  if (Session["UserName"] == null)
  {
  Response.Redirect("menu.ascx");
  }
  this.dlBind();
  }

  public string[] ReplyName = null;
  public string[] ReplyTime = null;
  public string[] ReplyContent = null;
  public string strName = null;

  public void dlBind()
  {
  string id = null;
  SqlData da = new SqlData();
  int curpage = Convert.ToInt32(labNowPage.Text);
  PagedDataSource ps = new PagedDataSource();
  SqlConnection mycon = new SqlConnection("Server=localhost;DataBase=db_Blog;uid=sa;pwd=");
  mycon.Open();
  string cmdtxt1 = "SELECT * FROM tb_LeaveWord WHERE Uid='" + Session["UserName"].ToString() + "'";
  SqlDataAdapter MyAdapter = new SqlDataAdapter(cmdtxt1, mycon);
  DataSet ds = new DataSet();
  MyAdapter.Fill(ds, "tb_LeaveWord");
  ps.DataSource = ds.Tables["tb_LeaveWord"].DefaultView;
  ps.AllowPaging = true; //是否可以分页
  ps.PageSize = 3; //显示的数量
  ps.CurrentPageIndex = curpage - 1; //取得当前页的页码
  lnkbtnPrve.Enabled = true;
  lnkbtnTop.Enabled = true;
  lnkbtnNext.Enabled = true;
  lnkbtnLast.Enabled = true;
  if (curpage == 1)
  {
  lnkbtnTop.Enabled = false;//不显示第一页按钮
  lnkbtnPrve.Enabled = false;//不显示上一页按钮
  }
  if (curpage == ps.PageCount)
  {
  lnkbtnNext.Enabled = false;//不显示下一页
  lnkbtnLast.Enabled = false;//不显示最后一页

  }
  this.labCount.Text = Convert.ToString(ps.PageCount);
  this.DataList1.DataSource = ps;
  this.DataList1.DataKeyField = "ID";
  this.DataList1.DataBind();
  }

  protected void lnkbtnTop_Click(object sender, EventArgs e)
  {
  this.labNowPage.Text = "1";
  this.dlBind();
  }
  protected void lnkbtnPrve_Click(object sender, EventArgs e)
  {
  this.labNowPage.Text = Convert.ToString(Convert.ToInt32(this.labNowPage.Text) - 1);
  this.dlBind();
  }
  protected void lnkbtnNext_Click(object sender, EventArgs e)
  {
  this.labNowPage.Text = Convert.ToString(Convert.ToInt32(this.labNowPage.Text) + 1);
  this.dlBind();
  }
  protected void lnkbtnLast_Click(object sender, EventArgs e)
  {
  this.labNowPage.Text = this.labCount.Text;
  this.dlBind();
  }
  protected void lnkbtnFeedBack_Click(object sender, EventArgs e)
  {
  Response.Redirect("LeaveWordBack.aspx?ID=" + Request["ID"].ToString() + "");
  }
  protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)