自己asp.net项目错误处理机制

网上看到好项目的错误处理机制，这里列出我的错误处理机制

    <customErrors mode="On" defaultRedirect="Error.aspx">
      <error statusCode="403" redirect="NoAccess.aspx" /> <!--访问被禁用-->
      <error statusCode="404" redirect="Nofound.aspx"/>
      <error statusCode="500" redirect="InternalError.aspx"/>
    </customErrors>

用log4net记录错误日志和发送电子邮件到开发人员

    Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
        ' 发生错误时激发
        '记录日志发送邮件（略）        

    End Sub

测试页面：

Imports System.Data
Imports System.Data.OleDb

Public Class _default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        'Throw New HttpException(401, "")
        Throw New HttpException(403, "")
        'Throw New HttpException(404, "")
        'Throw New HttpException(500, "")
    End Sub

End Class