c#中cookies

/////////////////////////////读取/////////////////////////////// 

//获得此cookie对象 

HttpCookie cookie = Request.Cookies["demo"]; 
//检验Cookie是否已经存在 
if (null == cookie) { 
Response.Write("Cookie not found. <br><hr>"); 
} 
else { 
//显示Cookie的值 
String strCookieValue = cookie.Value.ToString(); 
Response.Write("The " + strCookieName + " cookie contains: <b>" 
+ strCookieValue + "</b><br><hr>"); 
} 

/////////////////////////////写入/////////////////////////////// 

//创建一个新Cookie 
HttpCookie cookie = new HttpCookie("demo"); 
//设定Cookie的值 
cookie.Value = "value"; 
//设定cookie生命为1周，也就是7天 
cookie.Expires = DateTime.Now.AddDays(7); 
//添加Cookie 
Response.Cookies.Add(cookie);