How to Access page to multiple roles in asp.net

I have a one application in Asp.net with Linq and i already done with single role but i want to make multiple roles to single page.

 

Please review my code and please help me how to do it.

 

In Login Page i pass the roles to login user please see below code

 

FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(0, txtname.Text.Trim(), DateTime.Now, DateTime.Now.AddMinutes(2880), true, data[0].RoleName, FormsAuthentication.FormsCookiePath);

 

Next i Write Code in Global.asax

 

protected void Application_AuthenticateRequest(Object sender, EventArgs e)

{

if (HttpContext.Current.User != null)

{

if (HttpContext.Current.User.Identity.IsAuthenticated)

{

if (HttpContext.Current.User.Identity is FormsIdentity)

{

FormsIdentity id = (FormsIdentity)HttpContext.Current.User.Identity;

FormsAuthenticationTicket ticket = id.Ticket;

string userData = ticket.UserData;

string[] roles = userData.Split(',');

HttpContext.Current.User = new System.Security.Principal.GenericPrincipal(id, roles);

}

}

}

}

 

And Now in Page coding page load event i write below code

 

protected void Page_Load(object sender, EventArgs e)

{

if (!this.IsPostBack)

{

if (!this.Page.User.Identity.IsAuthenticated)

{

Response.Redirect("~/Logintest.aspx");

}

if (!this.Page.User.IsInRole("Administrator"))

{

Response.Redirect("~/Logintest.aspx");

}

}

}

 

Now I Want USe Multiple Roles To Access Particular Page in This section.

 

if (!this.Page.User.IsInRole("Administrator"))

{

Response.Redirect("~/Logintest.aspx");

}

 

Its for Asp.net not MVC.

Please help me how to do it.