BasePage.cs怎么控制权限_ASP.NET

BasePage.cs如何控制权限？
咨询个问题：我建立了一个BasePage.cs文件，在里面做权限控制，我是在构造函数里面做文章还是在OnInit方法里面做文章。代码如下：

C# code

    public class BasePage : System.Web.UI.Page    {        public BasePage()        {            this.Load += new System.EventHandler(Rank);        }        private void Rank(object sender, EventArgs e)        {            if (Session["username"] == null)            {                Response.Redirect("~/MyLogin.aspx");            }        }        protected override void OnInit(EventArgs e)        {            if (Session["username"] == null)            {                Response.Redirect("~/MyLogin.aspx");            }            base.OnInit(e);        }    }

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C# code

//需检查权限的页面public partial class Questions : MyPage{        protected void Page_Load(object sender, EventArgs e)        {            if (!IsPostBack)            {                ((SiteMaster)this.Master).CheckPermition(OES2.MyAccount.AccountRole.教师, "", 6);            }        }}//模板页public void CheckPermition(MyAccount.AccountRole BaseRole,string Title,int selectedIndex)        {            ShowTitle(Title,selectedIndex);            if (BaseRole == MyAccount.AccountRole.未定义)            {                MainContent.Visible = true;                HasErr = false;                ErrorState = "";                if (MyAccount.IsAccessed(Common.AccountSession, MyAccount.AccountRole.登录用户))                {                    div_unreged.Style.Add(HtmlTextWriterStyle.Display, "none");                    div_reged.Style.Add(HtmlTextWriterStyle.Display, "inline");                }                else                {                    div_unreged.Style.Add(HtmlTextWriterStyle.Display, "inline");                    div_reged.Style.Add(HtmlTextWriterStyle.Display, "none");                }            }            else            {                if (MyAccount.IsAccessed(Common.AccountSession, BaseRole))                {                    MainContent.Visible = true;                    HasErr = false;                    ErrorState = "";                    div_unreged.Style.Add(HtmlTextWriterStyle.Display, "none");                    div_reged.Style.Add(HtmlTextWriterStyle.Display, "inline");                }                else                {                    MainContent.Visible = false;                    HasErr = true;                    ErrorState = "-1";                    div_unreged.Style.Add(HtmlTextWriterStyle.Display, "inline");                    div_reged.Style.Add(HtmlTextWriterStyle.Display, "none");                }            }        }
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OnInit 就行了
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OnInit 里进行控制 足以