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if not page.isPostBack() then
btnSave.Attributes.Add(“onclick”,”
Javascript:return confirm(‘Are you sure to save?’);”)
end if
要注意的是‘return’，這是不可省的，
否則即使用戶點(diǎn)了取消，數(shù)據(jù)仍然會(huì)保存。

<asp:datagrid id="grd1" runat="server" 
OnItemDataBound = "ItemDataBound" >
  …Columns definition here
</asp:datagrid> 
此處說明OnItemDataBound事件發(fā)生時(shí)調(diào)用ItemDataBound方法，
在代碼后置文件中添加此方法的定義：
Sub ItemDataBound(ByVal sender As Object, 
ByVal e As DataGridItemEventArgs)
 If e.Item.ItemType <> ListItemType.Header And e.Item.ItemType 
<> ListItemType.Footer Then
 Dim oDeleteButton As LinkButton = e.Item.Cells(5).Controls(0)
 oDeleteButton.Attributes("onclick") = "javascript:return Confirm 
('Are you sure you want to delete" 
& DataBinder.Eval(e.Item.DataItem, "m_sName") & "?')"
 End If
End Sub

Protected Sub ItemEdit(ByVal source As Object, ByVal e As 
System.Web.UI.WebControls.DataGridCommandEventArgs)
Dim sDateCtrl as string
sDateCtrl = grd1. Items (e.Item.ItemIndex) . 
Cells(2). FindControl("txtDate") . ClientID
End Sub

Sub Item_Bound(ByVal sender As Object, 
ByVal e As DataGridItemEventArgs )
      Dim itemType As ListItemType
     itemType = CType(e.Item.ItemType, ListItemType)
     If (itemType <> ListItemType.Header) And _
      (itemType <> ListItemType.Footer) And _
      (itemType <> ListItemType.Separator) Then
      Dim oSelect As LinkButton = CType(e.Item.Cells(5).
Controls(0), LinkButton)
     e.Item.Attributes("onclick") = Page.
 GetPostBackClientHyperlink (oSelect, "")
End Sub

Page_Load方法如下：
Dim sCmd as string 
sCmd=Page.GetPostBackClientHyperlink(btnUpdate, "")
If not page.isPostback then
  Dropdownlist1.Attributes.add("onchange","ConfirmUpdate("""&sCmd&""")")
End if

ConfirmUpdate函數(shù)如下
<Script language=”javascript”>
   function ConfirmUpdate(cmd){
      if confirm(“Are you sure to update?”)
         eval(cmd);
}
</Script>