DataList中TextBox的OnTextChange事件

Aspx代码
 <DataList ID="dlblogs" Height="450" Width="100%" PageSize="18" CellPadding="0" EnableViewState="true"
            CellSpacing="0" runat="server" OnItemDataBound="BindDataItem" OnUpdateCommand="UpdateName" 
            RepeatColumns="3" CssClass="grbk_allarticlebg">
    <ItemStyle HorizontalAlign="left" VerticalAlign="top" />
    <ItemTemplate>
        <td width="200" height="136" align="center" valign="top">
            <table width="100" border="0" cellspacing="0" cellpadding="0">
                <tr>
                    <td height="35" align="center" class="blackfont">
                        <asp:Label ID="lblId" runat="server" Visible="false" Text='<%# Eval("Id") %>'></asp:Label>
                        <asp:TextBox ID="txtName" CssClass="input-none"  runat="server" Text='<%# Eval("Name") %>'></asp:TextBox>
                        <asp:LinkButton Text="Update" CommandName="Update" runat="server" ID="btn" Visible="false" />
                    </td>
                </tr>
            </table>
        </td>
    </ItemTemplate>
</DataList>

 <DataList ID="dlblogs" Height="450" Width="100%" PageSize="18" CellPadding="0" EnableViewState="true"
                                 CellSpacing="0" runat="server" OnItemDataBound="BindDataItem" OnUpdateCommand="UpdateName" 
                                RepeatColumns="3" CssClass="grbk_allarticlebg">
                                <ItemStyle HorizontalAlign="left" VerticalAlign="top" />
                                <ItemTemplate>
                                    <td width="200" height="136" align="center" valign="top">
                                        <table width="100" border="0" cellspacing="0" cellpadding="0">
                                            
                                            <tr>
                                                <td height="35" align="center" class="blackfont">
                                                    <asp:Label ID="lblId" runat="server" Visible="false" Text='<%# Eval("Id") %>'></asp:Label>
                                                    <asp:TextBox ID="txtName" CssClass="input-none"  runat="server" Text='<%# Eval("Name") %>'></asp:TextBox>
                                                    <asp:LinkButton Text="Update" CommandName="Update" runat="server" ID="btn" Visible="false" />
                                                </td>
                                            </tr>
                                        </table>
                                    </td>
                                </ItemTemplate>
                            </DataList>

cs代码

cs
#region ItemDataBound
    protected void   BindDataItem(object   src,DataListItemEventArgs   e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            TextBox box = e.Item.FindControl("txtName") as TextBox;
            LinkButton btn = e.Item.FindControl("btn") as LinkButton;
            if (box != null && btn != null)
            {
                box.Attributes.Add("onchange", this.GetPostBackEventReference(btn));
            }
        }   
    }
    #endregion

#region Update
    protected void UpdateName(object src, DataListCommandEventArgs e)
    {
        TextBox box = e.Item.FindControl("txtName") as TextBox;
        if (box != null)
        {
            //在此做相应的处理事件
        }
    }
    #endregion