HttpCookie asp.net

ASP.NET > HttpCookie 

The HttpCookie class gets and sets properties of individual cookies.

HttpCookie loginCookie = Request.Cookies.Get("loginCookie");
if (loginCookie == null)
{
     loginCookie = new HttpCookie("loginCookie");
     loginCookie.Value = txtUsr.Text;
     loginCookie.Expires = DateTime.Now.AddDays(15);
     Response.Cookies.Add(loginCookie);
}