没报错，但修改不了datelist绑定在TextBox的值啊，大家帮我看看是什么问题

Question

这个小小问题，弄了我半天弄不出来，晕了。大家帮帮忙
前台
    <asp:DataList ID="DataList1" runat="server" Width="500px"
      onitemcommand="DataList1_ItemCommand" >
        <ItemTemplate>
            <table cellpadding="0" cellspacing="0" class="style2">
                <tr>
                    <td>
                        <asp:Label ID="lbId" runat="server" Text='<%#Eval("id") %>' Visible="false"></asp:Label>
                        <%# Eval("title") %>
                        </td>
                </tr>
                <tr>
                    <td>
                         <%# Eval("time") %>
                        </td>
                </tr>
                <tr>
                    <td>
                         <%# Eval("text") %></td>
                </tr>
                <tr>
                    <td>
                        <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Edit">【修改】</asp:LinkButton>
                        <asp:LinkButton ID="LinkButton2" runat="server" CommandName="Delete">【删除】</asp:LinkButton>
                       
                </tr>
            </table>
        </ItemTemplate>
        <EditItemTemplate>
            <table class="style2">
                <tr>
                    <td>
                        <asp:Label ID="Label1" runat="server" Text='<%#Eval("id") %>'></asp:Label>
                        <asp:Label ID="Label3" runat="server" Text="标题："></asp:Label>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%#Eval("title") %>'></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Label ID="Label2" runat="server" Text="内容" ></asp:Label>
                        <asp:TextBox ID="TextBox2" runat="server" Height="150px" TextMode="MultiLine" Text='<%#Eval("text") %>' 
                            Width="100%"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:LinkButton ID="LinkButton4" runat="server" CommandName="Update">确认修改</asp:LinkButton>&nbsp;
                       
                        <asp:LinkButton ID="LinkButton3" runat="server" CommandName="Cancel">取消</asp:LinkButton>
                    </td>
                </tr>
                <tr>
                    <td>
                        &nbsp;</td>
                </tr>
            </table>
        </EditItemTemplate>
    </asp:DataList>后台
  protected void Page_Load(object sender, EventArgs e)
    {
      
        Data_Bind();
    }
    protected void Data_Bind()
    {
        string sql = "select * from notice where id=" + Convert.ToInt32(Request.QueryString["id"]);
        string sqlstr = ConfigurationManager.ConnectionStrings["webConnectionString1"].ToString();
        SqlConnection con = new SqlConnection(sqlstr);
        SqlDataAdapter cmd = new SqlDataAdapter(sql, con);
        DataSet dt = new DataSet();
        cmd.Fill(dt, "notice");
        this.DataList1.DataSource = dt.Tables["notice"].DefaultView;
        DataList1.DataKeyField = "id";
        this.DataList1.DataBind();
       
    }
    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        string sqlstr = ConfigurationManager.ConnectionStrings["webConnectionString1"].ToString();
        SqlConnection con = new SqlConnection(sqlstr);
        if (e.CommandName == "Edit")
        {
            DataList1.EditItemIndex = e.Item.ItemIndex;
            this.Data_Bind();
        }        if (e.CommandName == "Update")
        {
            string ID = DataList1.DataKeys[e.Item.ItemIndex].ToString();
           //string id = ((Label)e.Item.FindControl("Label1")).Text;
        string title = ((TextBox)e.Item.FindControl("TextBox1")).Text;
        string text = ((TextBox)e.Item.FindControl("TextBox2")).Text;  
           // string sql = "update notice set title='" + title + "',text='" + text + "' where id='" + id + "'";
          string sql = "update notice set title='" + title + "',text='" + text + "'where id='" + ID + "' ";
          con.Open();
            SqlCommand cmd = new SqlCommand(sql, con);          
            cmd.ExecuteNonQuery();
            con.Close();      
            DataList1.EditItemIndex = -1;              
           this.Data_Bind();
           
        }
        }
}

Answer 1

//改為這個
if (!Page.IsPostBack)
        {
            Data_Bind();
        }