请高手请教一个DataGrid的问题！（高分）（js与后台代码的结合问题）

小弟有一个问题,
我想每次按一下删除按钮(放在datagrid的模板列里),然后弹出messagebox,提示确认删除,然后按确定按钮,则触发我编写的后台代码.
Sub DataGrid_ItemCreated(ByVal Sender As Object, ByVal e As DataGridItemEventArgs) Handles DgComment.ItemCreated
Select Case e.Item.ItemType
Case ListItemType.Item, ListItemType.AlternatingItem, ListItemType.EditItem
Dim myDeleteButton As Button
myDeleteButton = e.Item.FindControl("BtnDelete")
myDeleteButton.Attributes.Add("onclick", "return confirm('是否确定要删除该评论，对该用户来说将损失其名望值?');")
End Select
End Sub <-- 可以实现的,即每个按钮按下都会弹出,但小弟不知其机理,ItemCreate是什么?还有为什么要加Select case ,e.Item.FindControl("BtnDelete")为什么没有cells,因为我还没有指明第几列?

Sub DataGrid_ItemCommand(ByVal sender As Object, ByVal e As DataGridCommandEventArgs) Handles DgComment.ItemCommand
If e.CommandName = "DeleteComment" Then
Dim conn As New Connection.DataBase()
Dim str As String
Dim CommentID As String
CommentID = e.Item.Cells(1).Text.Trim.ToString
str = "DeleteComment '" + CommentID + "'"
conn.NoQuery(str)
conn.Dispose()

Dim record As String
record = "删除文章作者为" + LblAuthor.Text.Trim + ",文章名为" + LblArticleTitle.Text.Trim + "的评论"
RecordAction(Session("Nick"), record)

End If
End Sub
<--按钮按下去之后的后台代码,但它更本不执行!为什么,请高手指教,还有一种方法是在前台(aspx)中编写代码,如下:

<asp:Button id="BtnDelete" CommandName="DeleteComment" OnClick="DataGrid_DeleteRow" runat="server" Text="删除该评论"></asp:Button>

Sub DataGrid_DeleteRow(ByVal sender As Object, ByVal e As EventArgs)

Response.Write("HEY, you can't delete that company!")
End Sub

但我想要编写后台代码而不是前台,该如何做呢 ?