DataGrid实现增删（带提示）改和分页

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ASP ASP.net UI Web Microsoft

或许大家会说，网上已经很多类似文章了，包括孟子的，为什么要再写一次？
我想我们不仅仅要会实现，更多的是需要理解。
下面先帖出代码，再分析一下其中的一些关键代码。
数据库表名:tb1，其中有3个字段，分别是ID自增的主键、vName varchar(50)、iAge int
（以下代码没有做任何错误捕获处理）

前台

<%...@ Page language="c#" Codebehind="WebForm5.aspx.cs" AutoEventWireup="false" Inherits="csdn.WebForm5" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm5</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:textbox id="TextBox1" runat="server" Width="88px"></asp:textbox>
<asp:TextBox id="TextBox2" runat="server" Width="40px"></asp:TextBox>
<asp:Button id="Button1" runat="server" Text="添加"></asp:Button>
<asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False" DataKeyField="ID" AllowPaging="True"
PageSize="5" OnEditCommand="edit" OnCancelCommand="cancel" OnUpdateCommand="update">
<Columns>
<asp:TemplateColumn HeaderText="姓名">
<ItemTemplate>
<%...# DataBinder.Eval(Container.DataItem,"vName") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="name" Runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"vName") %>' Width="88px">
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="年龄">
<ItemTemplate>
<%...# DataBinder.Eval(Container.DataItem,"iAge") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="age" Runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"iAge") %>' Width="40px">
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:EditCommandColumn UpdateText="更新" CancelText="取消" EditText="编辑"></asp:EditCommandColumn>
<asp:ButtonColumn Text="删除" CommandName="del"></asp:ButtonColumn>
</Columns>
<PagerStyle Mode="NumericPages"></PagerStyle>
</asp:datagrid></form>
</body>
</HTML>

后台

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace csdn
...{
/**//// <summary>
/// WebForm5 的摘要说明。
/// </summary>
public class WebForm5 : System.Web.UI.Page
...{
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
...{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
...{
SetBind();
}
}

protected void SetBind()
...{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
SqlDataAdapter da=new SqlDataAdapter("select * from tb1",conn);
DataSet ds=new DataSet();
da.Fill(ds,"table1");
this.DataGrid1.DataSource=ds.Tables["table1"];
this.DataGrid1.DataBind();
}

Web 窗体设计器生成的代码

private void Button1_Click(object sender, System.EventArgs e)
...{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
SqlCommand comm=new SqlCommand("insert into tb1 (vName,iAge) values (@vName,@iAge)",conn);
SqlParameter parm1=new SqlParameter("@vName",SqlDbType.NVarChar,50);
parm1.Value=this.TextBox1.Text;
SqlParameter parm2=new SqlParameter("@iAge",SqlDbType.Int);
parm2.Value=this.TextBox2.Text;
comm.Parameters.Add(parm1);
comm.Parameters.Add(parm2);
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
SetBind();
}

private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
...{
if(e.CommandName=="del")
...{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
SqlCommand comm=new SqlCommand("delete from tb1 where ID=@id",conn);
SqlParameter parm1=new SqlParameter("@id",SqlDbType.Int);
parm1.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex];
comm.Parameters.Add(parm1);
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
SetBind();
}
}

private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
...{
this.DataGrid1.CurrentPageIndex=e.NewPageIndex;
SetBind();
}

protected void edit(object sender,DataGridCommandEventArgs e)
...{
this.DataGrid1.EditItemIndex=e.Item.ItemIndex;
SetBind();
}

protected void cancel(object sender,DataGridCommandEventArgs e)
...{
w