Code
前始:
<asp:Substitution runat="Server" ID="SubstitutionLogin" MethodName="SetLoginStatus" />

后台:
 public static string SetLoginStatus(HttpContext context)
        {
            string reStr = "";
            try
            {
                if (context.Session["User_Id"] == null)
                {
                    reStr = "<ul class=\"hello\"><li>您好，欢迎来到试客联盟！</li><li><a href=\"Login.aspx?URL=" + context.Request.Url.ToString() + "\">[ 请登陆 ]</a></li><li><a href=\"Register2.aspx\">[ 免费注册 ]</a></li><li><a href=\"Register2.aspx?type=1\">[ 企业会员注册 ]</a></li></ul>";
                }
                else
                {
                    if (context.Session["user"] != null)
                    {
                        Shikee.DBUtility.Base.User user = context.Session["user"] as Shikee.DBUtility.Base.User;
                        reStr = "<ul class=\"hello\"><li>您好，{0}，欢迎来到试客联盟！</li><li>[<a href='{1}' > 后台管理</a>] </li><li>[<a href='LogOut.aspx' >退出</a>]</li></ul>";


                        if (((Shikee.DBUtility.Base.User)context.Session["user"]).Usertype_id == 1)
                        {                           
                            reStr = String.Format(reStr, ((Shikee.DBUtility.Base.User)context.Session["user"]).User_nickname, "/UserMember/UserPerson/index.aspx");
                        }
                        else
                        {
                            reStr = String.Format(reStr, ((Shikee.DBUtility.Base.User)context.Session["user"]).User_nickname, "/UserMember/UserCompany/index.aspx");
                        }
                    }
                }
            }
            catch
            {
                reStr = "<ul class=\"hello\"><li>您好，欢迎来到试客联盟！</li><li><a href=\"Login.aspx?URL=" + context.Request.Url.ToString() + "\">[ 请登陆 ]</a></li><li><a href=\"Register2.aspx\">[ 免费注册 ]</a></li><li><a href=\"Register2.aspx?type=1\">[ 企业会员注册 ]</a></li></ul>";
            }
            return reStr;
        }