Parser error on redirect?

Question

I get a parser error when running my code and have checked references but everything seems in place.The error occurs when on a redirect from a page The error occurs on line 1.

<%@ Page Title="CreateUser" Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="CreateUser.aspx.cs" 
    Inherits="ICSWebPortal.Portal.Pages.User.CreateUser" PageName="Create User" PageDescription="Details of user" %>
<%@ MasterType VirtualPath="~/Main.Master" %>

This is my redirect function on another page

function CreateNewUser()
{
    window.location = "<% = GetHost() %>/User/Create/"
}

Answer 1

window.location = "<%= GetHost() %>/User/Create/";

OR

window.location = "<%# GetHost() %>/User/Create/";

OR

window.location = "<%: GetHost() %>/User/Create/";

Either one of them should work.