public void ProcessRequest (HttpContext context)
{
    string Message = "";
    try
    {
        string EmailId = HttpContext.Current.Request["emailid"].ToString();
        string Password = HttpContext.Current.Request["Password"].ToString();

        string User = "";

        Entities.UserTable user = null;
        UserDAL userDAL = new UserDAL();
        user = userDAL.UserLogin(EmailId, Password);
        if (user != null)
        {
            int userId = user.Id;

            string roles = "User";
            bool rememberUserName = true;
            FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
                1, // Ticket version
                user.Id.ToString(),// Username to be associated with this ticket
                DateTime.Now, // Date/time ticket was issued
                DateTime.Now.AddYears(20), // Date and time the cookie will expire
                rememberUserName, // if user has chcked rememebr me then create persistent cookie
                roles, // store the user data, in this case roles of the user
                FormsAuthentication.FormsCookiePath); // Cookie path specified in the web.config file in <Forms> tag if any.

            string hashCookies = FormsAuthentication.Encrypt(ticket);
            HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, hashCookies); // Hashed ticket
            cookie.Expires = DateTime.Now.AddYears(20);
            HttpContext.Current.Response.Cookies.Add(cookie);

            Message = "success";
        }
        else
        {
            Message = "Please check your Mailid or password.";
        }
    }
    catch(Exception ex)
    {
        Message = "Please contact Support";
    }

    context.Response.ContentType = "text/plain";
    context.Response.Write(Message);
}