网友问这个问题，写了一个简单的例子：


前台：
  1<%@ Page language="c#" Codebehind="WebForm4.aspx.cs" AutoEventWireup="false" Inherits="WebApplication25.WebForm4" %>
  2<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
  3<HTML>
  4    <HEAD>
  5        <title>WebForm4</title>
  6        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
  7        <meta name="CODE_LANGUAGE" Content="C#">
  8        <meta name="vs_defaultClientScript" content="JavaScript">
  9        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
 10    </HEAD>
 11    <body>
 12        <form id="Form1" method="post" runat="server">
 13            <asp:DataGrid id="DataGrid1" runat="server" AutoGenerateColumns="False" DataKeyField="EmployeeID">
 14                <Columns>
 15                    <asp:TemplateColumn>
 16                        <ItemTemplate>
 17                            <input type="hidden" id="SelectedID" runat="server" value='<%# Container.ItemIndex%>' name="SelectedID"/>
 18                            <asp:CheckBox ID="chkExport" Runat="server" />
 19                        </ItemTemplate>
 20                    </asp:TemplateColumn>
 21                    <asp:BoundColumn DataField="EmployeeID" HeaderText="EmployeeID"></asp:BoundColumn>
 22                    <asp:TemplateColumn HeaderText="FirstName">
 23                        <ItemTemplate>
 24                            <asp:Label ID="lab_FirstName" Runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"FirstName")%>'>
 25                            </asp:Label>
 26                            <asp:TextBox ID="txt_FirstName" Runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"FirstName")%>' Visible="False">
 27                            </asp:TextBox>
 28                        </ItemTemplate>
 29                    </asp:TemplateColumn>
 30                    <asp:TemplateColumn HeaderText="LastName">
 31                        <ItemTemplate>
 32                            <asp:Label ID="lab_LastName" Runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"LastName")%>'>
 33                            </asp:Label>
 34                            <asp:TextBox ID="txt_LastName" Runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"LastName")%>' Visible="False">
 35                            </asp:TextBox>
 36                        </ItemTemplate>
 37                    </asp:TemplateColumn>
 38                </Columns>
 39            </asp:DataGrid>
 40            <asp:Button id="Button1" runat="server" Text="编辑"></asp:Button>
 41            <asp:Button id="Button2" runat="server" Text="更新"></asp:Button>
 42        </form>
 43    </body>
 44</HTML>
 45
 46后台：
 47
 48using System;
 49using System.Collections;
 50using System.ComponentModel;
 51using System.Data;
 52using System.Data.SqlClient;
 53using System.Drawing;
 54using System.Web;
 55using System.Web.SessionState;
 56using System.Web.UI;
 57using System.Web.UI.WebControls;
 58using System.Web.UI.HtmlControls;
 59
 60namespace WebApplication25
 61{
 62    /// <summary>
 63    /// WebForm4 的摘要说明。
 64    /// </summary>
 65    public class WebForm4 : System.Web.UI.Page
 66    {
 67        protected System.Web.UI.WebControls.Button Button1;
 68        protected System.Web.UI.WebControls.Button Button2;
 69        protected System.Web.UI.WebControls.DataGrid DataGrid1;
 70        protected System.Web.UI.HtmlControls.HtmlInputHidden SelectID;
 71    
 72        private void Page_Load(object sender, System.EventArgs e)
 73        {
 74            // 在此处放置用户代码以初始化页面
 75            if(!IsPostBack)
 76            {
 77                SetBind();
 78            }
 79        }
 80
 81        private void SetBind()
 82        {
 83            SqlConnection conn=new SqlConnection("server=srvxglai-sha;uid=sa;pwd=321413;database=northwind");
 84            SqlDataAdapter da=new SqlDataAdapter("select * from Employees",conn);
 85            DataSet ds=new DataSet();
 86            da.Fill(ds,"table1");
 87            this.DataGrid1.DataSource=ds.Tables["table1"];
 88            this.DataGrid1.DataBind();            
 89        }
 90
 91
 92        #region Web 窗体设计器生成的代码
 93        override protected void OnInit(EventArgs e)
 94        {
 95            //
 96            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
 97            //
 98            InitializeComponent();
 99            base.OnInit(e);
100        }
101        
102        /// <summary>
103        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
104        /// 此方法的内容。
105        /// </summary>
106        private void InitializeComponent()
107        {    
108            this.Button1.Click += new System.EventHandler(this.Button1_Click);
109            this.Button2.Click += new System.EventHandler(this.Button2_Click);
110            this.Load += new System.EventHandler(this.Page_Load);
111
112        }
113        #endregion
114
115        private void Button1_Click(object sender, System.EventArgs e)
116        {
117            foreach(DataGridItem di in this.DataGrid1.Items) 
118            { 
119                if(((CheckBox)di.FindControl("chkExport")).Checked==true) 
120                { 
121                    ((TextBox)di.FindControl("txt_FirstName")).Visible=true;
122                    ((TextBox)di.FindControl("txt_LastName")).Visible=true;
123                    ((Label)di.FindControl("lab_FirstName")).Visible=false;
124                    ((Label)di.FindControl("lab_LastName")).Visible=false;
125                } 
126            } 
127
128        }
129
130        private void Button2_Click(object sender, System.EventArgs e)
131        {
132            foreach(DataGridItem di in this.DataGrid1.Items) 
133            { 
134                if(((CheckBox)di.FindControl("chkExport")).Checked==true) 
135                { 
136                    if(((TextBox)di.FindControl("txt_FirstName")).Text!=((Label)di.FindControl("lab_FirstName")).Text||((TextBox)di.FindControl("txt_LastName")).Text!=((Label)di.FindControl("lab_LastName")).Text)
137                    {
138                        Response.Write("记录号:"+this.DataGrid1.DataKeys[int.Parse(((HtmlInputHidden)di.FindControl("SelectedID")).Value)]+",FirstName:"+((TextBox)di.FindControl("txt_FirstName")).Text+",LastName:"+((TextBox)di.FindControl("txt_LastName")).Text+"<br>");
139                    }
140                    ((TextBox)di.FindControl("txt_FirstName")).Visible=false;
141                    ((TextBox)di.FindControl("txt_LastName")).Visible=false;
142                    ((Label)di.FindControl("lab_FirstName")).Visible=true;
143                    ((Label)di.FindControl("lab_LastName")).Visible=true;
144                    ((CheckBox)di.FindControl("chkExport")).Checked=false;
145                }
146            }
147        }
148    }
149}
150