问sqlexception 'timeout expired'？

EN

void Application_AuthorizeRequest(object sender, EventArgs e)
{
    if (Membership.GetUser() != null && Roles.IsUserInRole("UnFilled")) // this is where I get the exception
    {
        if (Response.Cookies["Expiration"] == null)
        {
            HttpRequest request = Context.Request;
            HttpResponse response = Context.Response;
            response.ContentType = ".aspx";
            response.Write(request.Url.Host + "/Activate.aspx?account="+Membership.GetUser().Email);  
        }
    }      
}