we can set cookies for pages like aspx/asmx/Static resource files(ex:images)

HttpCookie cookie = new HttpCookie("test1");
cookie.Value = "test1Value";

cookie.Expires = DateTime.Now.AddYears(1);
this.Response.AppendCookie(cookie);

same in javascript

document.cookie = escape('test1') + '=' + escape('test1Value');

or

var exp = new Date((new Date()).getTime() + minutes*60000);
    document.cookie = escape(name) + '=' + escape(value) + '; expires=' + exp.toGMTString();var exp = new Date((new Date()).getTime() + minutes*60000);
    document.cookie = escape('test1') + '=' + escape('test1Value') + '; expires=' + exp.toGMTString();

this makes cookie entry Set-Cookie: test1=test1Value; path=/

You can make as many as 50 cookies(nameValue pairs)