DataGrid 模板列的问题(在线等)

我在DataGrid添加了一个模板列,然后再编辑模板列时加了一个Button控件，
暂时没有加任何事件，可我在点这个Button后，出来一个错误:

异常详细信息: System.ArgumentException: 回发或回调参数无效。在配置中使用 <pages enableEventValidation="true"/> 或在页面中使用 <%@ Page EnableEventValidation="true" %> 启用了事件验证。出于安全目的，此功能验证回发或回调事件的参数是否来源于最初呈现这些事件的服务器控件。如果数据有效并且是预期的，则使用 ClientScriptManager.RegisterForEventValidation 方法来注册回发或回调数据以进行验证。

这是怎么回事?

.cs代码如下:
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 webtest1 : System.Web.UI.Page
{
private string sqlStr = System.Configuration.ConfigurationManager.AppSettings["Sqlstr"].ToString();
private DataSet ds;
private DataView dv;
public static SqlConnection sqlConn;
protected void Page_Load(object sender, EventArgs e)
{
sqlConn = new SqlConnection(sqlStr);
bindData();
if (!Page.IsPostBack)
{ }

}
private void bindData()
{
// using (sqlConn)
// {
sqlConn.Open();
SqlCommand cmd = new SqlCommand("SPBookInfo", sqlConn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter parameter1 = new SqlParameter("@BookAdress", SqlDbType.VarChar, 20);
parameter1.Value = "B";
cmd.Parameters.Add(parameter1);
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
ds = new DataSet();
da.Fill(ds);
dv = ds.Tables[0].DefaultView;
Session["dv"] = dv;
BookDG.DataSource = dv;

BookDG.DataBind();
da.Dispose();
sqlConn.Close();

// }
}


protected void BookDG_ItemCommand(object source, DataGridCommandEventArgs e)
{
if (e.CommandName == "ghgfh")
{
bindData();

}
}
}

.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="webtest1.aspx.cs" Inherits="webtest1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<div style="text-align: center">
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td align="left" colspan="3" style="height: 120px" valign="top">
<asp:DataGrid ID="BookDG" runat="server" Height="120px" Width="313px" OnItemCommand="BookDG_ItemCommand" >
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
 <asp:Button ID="Button1" runat="server" CommandName="ghgfh" Text="Button" />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid></td>
</tr>
<tr>
<td align="center" style="width: 100px; height: 19px" valign="bottom">
</td>
<td align="center" style="width: 100px; height: 19px" valign="bottom">
</td>
<td align="center" style="width: 100px; height: 19px" valign="bottom">
</td>
</tr>
</table>
</div>

</div>
</form>
</body>
</html>