This is the syntax for creating a cookies.
HttpCookie SiteCookies = new HttpCookie("UserInfo");
SiteCookies["UserName"] = "Pradeep";
SiteCookies["sitename"] = "dotnetRed";
SiteCookies["Expire"] = "5 Days";
SiteCookies= DateTime.Now.AddDays(5);
Response.Cookies.Add(SiteCookies);
Now syntax to remove this cookie:-
HttpCookie SiteCookies= new HttpCookie("UserInfo");
siteCookies= DateTime.Now.A
ddDays(-1);
Response.Cookies.AddSiteCookies