在删除数据前进行确认是一个非常友好的做法。在本文里，我们就讨论利用TemplateColumn和Button服务端控件实现这种功能的方法。
DeleteIt.aspx
1@ Page Language="vb" AutoEventWireup="false" Codebehind="DeleteIt.aspx.vb" Inherits="aspxWeb.DeleteIt"
后代码：DeleteIt.aspx.vb
Imports System.Web Imports System.Collections Imports System Imports System.Data Imports System.Data.OleDb Imports System.Web.UI.WebControls Public Class DeleteIt Inherits System.Web.UI.Page Protected WithEvents Label1 As System.Web.UI.WebControls.Label Protected WithEvents myDataGrid As System.Web.UI.WebControls.DataGrid #Region " Web 窗体设计器生成的代码 " '该调用是 Web 窗体设计器所必需的。 Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: 此方法调用是 Web 窗体设计器所必需的 '不要使用代码编辑器修改它。 InitializeComponent() End Sub #End Region Sub Page_Load(ByVal Sender As Object, ByVal e As EventArgs) Handles MyBase.Load myDataGrid.HeaderStyle.Font.Bold = True myDataGrid.HeaderStyle.HorizontalAlign = HorizontalAlign.Center myDataGrid.Columns(0).HeaderText = "操作" myDataGrid.Columns(1).HeaderText = "标题" myDataGrid.Columns(2).HeaderText = "发布日期" If Not IsPostBack Then Dim strCn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Test.mdb") Dim strSql As String strSql = "SELECT Top 15 objectGuid,Title,CreateDate FROM Document Order By CreateDate Desc" Dim cn As New OleDbConnection(strCn) cn.Open() Dim cmd As New OleDbCommand(strSql, cn) myDataGrid.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection) myDataGrid.DataBind() cmd.Dispose() cmd = Nothing cn.Close() cn.Dispose() cn = Nothing End If End Sub Sub DataGrid_ItemCreated(ByVal Sender As Object, ByVal e As DataGridItemEventArgs)_ Handles myDataGrid.ItemCreated Select Case e.Item.ItemType Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem Dim myDeleteButton As Button myDeleteButton = e.Item.FindControl("btnDelete") myDeleteButton.Text = "删除此行" myDeleteButton.Attributes.Add("onclick", "return confirm('您真的要删除第 "_ + e.Item.ItemIndex.ToString + " 行吗？');") End Select End Sub Private Sub myDataGrid_ItemCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs)_ Handles myDataGrid.ItemCommand Response.Write("您要删除的是： " + e.Item.Cells(1).Text + " ") e.Item.BackColor = System.Drawing.Color.Ivory End Sub End Class
在DataGrid里添加确认删除的对话框，第二个办法就是利用ButtonColumn，这个办法与 第一个方法 不同的是：我们不能使用FindControl方法来引用Button控件，这是因为，我们不知道由ButtonColumn产生的每个Button控件的ID，我们这里可以使用TableCell来引用TableCell里的Button控件，一旦引用了Button控件，我们就可以用Attributes集合来添加Onclick事件。源代码如下：
DeleteIt2.aspx
1@ Page Language="vb" AutoEventWireup="false" Codebehind="DeleteIt2.aspx.vb" Inherits="aspxWeb.DeleteIt2"
DeleteIt2.aspx.vb
Imports System Imports System.Web Imports System.Data Imports System.Data.OleDb Imports System.Web.UI.WebControls Public Class DeleteIt2 Inherits System.Web.UI.Page Protected WithEvents Label1 As System.Web.UI.WebControls.Label Protected WithEvents myDataGrid As System.Web.UI.WebControls.DataGrid #Region " Web 窗体设计器生成的代码 " '该调用是 Web 窗体设计器所必需的。 Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs)_ Handles MyBase.Init 'CODEGEN: 此方法调用是 Web 窗体设计器所必需的 '不要使用代码编辑器修改它。 InitializeComponent() End Sub #End Region Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)_ Handles MyBase.Load '在此处放置初始化页的用户代码 myDataGrid.HeaderStyle.HorizontalAlign = HorizontalAlign.Center myDataGrid.HeaderStyle.Font.Bold = True myDataGrid.HeaderStyle.BackColor = System.Drawing.Color.Ivory myDataGrid.Columns(0).HeaderText = "操作" myDataGrid.Columns(1).HeaderText = "标题" myDataGrid.Columns(2).HeaderText = "创建日期" If Not IsPostBack Then Dim strCn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" _ + Server.MapPath("Test.mdb") Dim strSql As String = "SELECT Top 15 objectGuid,Title,CreateDate"_ + " FROM Document Order By CreateDate Desc" Dim cn As New OleDbConnection(strCn) cn.Open() Dim cmd As New OleDbCommand(strSql, cn) myDataGrid.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection) myDataGrid.DataBind() cmd.Dispose() cmd = Nothing cn.Close() cn.Dispose() cn = Nothing End If End Sub Public Sub DataGrid_ItemCreated(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles myDataGrid.ItemCreated Select Case e.Item.ItemType Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem Dim myTableCell As TableCell myTableCell = e.Item.Cells(0) Dim myDeleteButton As LinkButton myDeleteButton = myTableCell.Controls(0) myDeleteButton.Attributes.Add("onclick", "return confirm('您真的要删除此行吗？');") myDeleteButton.Text = "删除此行" End Select End Sub Sub MyDataGrid_Delete(ByVal Sender As Object, ByVal E As DataGridCommandEventArgs) Label1.Text = "你要删除的是： " _ + myDataGrid.DataKeys(CInt(E.Item.ItemIndex)) + " " E.Item.BackColor = System.Drawing.Color.Tomato End Sub End Class
在DataGrid里添加确认删除的对话框，第三个办法就是利用Page对象的RegisterOnSubmitStatement方法。Page.RegisterOnSubmitStatement方法能够使页面能够访问客户端 OnSubmit 事件。脚本应该是注册在其他地方的对客户端代码的函数调用。源代码如下：
DeleteIt3.aspx
1@ Page Language="vb" AutoEventWireup="false" Codebehind="DeteleIt3.aspx.vb" Inherits="aspxWeb.DeteleIt3"
后代码DeteleIt3.aspx.vb
Imports System.Web Imports System.Data Imports System.Data.OleDb Public Class DeteleIt3 Inherits System.Web.UI.Page Protected WithEvents Label1 As System.Web.UI.WebControls.Label Protected WithEvents myDataGrid As System.Web.UI.WebControls.DataGrid #Region " Web 窗体设计器生成的代码 " '该调用是 Web 窗体设计器所必需的。 Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: 此方法调用是 Web 窗体设计器所必需的 '不要使用代码编辑器修改它。 InitializeComponent() End Sub #End Region Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load '在此处放置初始化页的用户代码 If Not IsPostBack Then Dim strCn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("Test.mdb") Dim strSql As String = "SELECT Top 15 Title,CreateDate FROM Document Order By CreateDate Desc" Dim cn As New OleDbConnection(strCn) cn.Open() Dim cmd As New OleDbCommand(strSql, cn) myDataGrid.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection) myDataGrid.DataBind() cmd.Dispose() cmd = Nothing cn.Close() cn.Dispose() cn = Nothing End If Page.RegisterOnSubmitStatement("OnSubmit", "{return confirm('您真的要删除此行吗？？') } ") End Sub Sub myDataGrid_ItemCreated(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles myDataGrid.ItemCreated Select Case e.Item.ItemType Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem Dim myTableCell As TableCell myTableCell = e.Item.Cells(0) Dim myDeleteButton As Button myDeleteButton = myTableCell.Controls(0) myDeleteButton.Text = "删除此行" Case ListItemType.Header e.Item.Font.Bold = True e.Item.HorizontalAlign = HorizontalAlign.Center e.Item.BackColor = System.Drawing.Color.Ivory e.Item.Cells(0).Text = "操作" e.Item.Cells(1).Text = "文章标题" e.Item.Cells(2).Text = "发布日期" End Select End Sub Private Sub myDataGrid_DeleteCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles myDataGrid.DeleteCommand Label1.Text = "您删除的是： " + myDataGrid.DataKeys(CInt(e.Item.ItemIndex)) + " " e.Item.BackColor = System.Drawing.Color.Tomato End Sub End Class