GridView:
<asp:LinkButton ID="LinkButton1" runat="server" CommandArgument='<%# Eval("MailID") %>' CommandName="DeleteMail" 
        OnClientClick="return confirm('是否删除?');">删除</asp:LinkButton>


页面使用：
1.关闭时提示“是否关闭”
Response.Write("<script language:javascript>javascript:window.close();</script>");
2.直接关闭不提示
Response.Write("<script language:javascript>javascript:window.opener=null;window.close();</script>");