How to use TextBox instead of Login control in Forms Authentication in ASP.Net

Refer This :

http://www.aspsnippets.com/Articles/Implement-Role-based-security-using-Forms-Authentication-in-ASPNet.aspx

I want same functionality but im not using Login Control .. I am using TextBox for Username and Password and a login Button .. can i do the same ??

FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, Login1.UserName, DateTime.Now, DateTime.Now.AddMinutes(2880), Login1.RememberMeSet, roles, FormsAuthentication.FormsCookiePath);
string hash = FormsAuthentication.Encrypt(ticket);
HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, hash);

if (ticket.IsPersistent)
{
    cookie.Expires = ticket.Expiration;
}
Response.Cookies.Add(cookie);
Response.Redirect(FormsAuthentication.GetRedirectUrl(Login1.UserName, Login1.RememberMeSet));
break;