asp.net Cookie操作类

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls; 
using System.Web.UI.WebControls; 
using System.Data; 
using System.Configuration; 

namespace Jhgl.Smart 
{ 
/// <summary> 
/// Cookie操作类 
/// </summary> 
public class Cookie 
{ 
/// <summary> 
/// 保存一个Cookie 
/// </summary> 
/// <param name="CookieName">Cookie名称</param> 
/// <param name="CookieValue">Cookie值</param> 
/// <param name="CookieTime">Cookie过期时间(小时),0为关闭页面失效</param> 
public static void SaveCookie(string CookieName, string CookieValue, double CookieTime) 
{ 
HttpCookie myCookie = new HttpCookie(CookieName); 
DateTime now = DateTime.Now; 
myCookie.Value = CookieValue; 

if (CookieTime != 0) 
{ 
//有两种方法，第一方法设置Cookie时间的话，关闭浏览器不会自动清除Cookie 
//第二方法不设置Cookie时间的话，关闭浏览器会自动清除Cookie ,但是有效期 
//多久还未得到证实。 
myCookie.Expires = now.AddDays(CookieTime); 
if (HttpContext.Current.Response.Cookies[CookieName] != null) 
HttpContext.Current.Response.Cookies.Remove(CookieName); 

HttpContext.Current.Response.Cookies.Add(myCookie); 
} 
else 
{ 
if (HttpContext.Current.Response.Cookies[CookieName] != null) 
HttpContext.Current.Response.Cookies.Remove(CookieName); 

HttpContext.Current.Response.Cookies.Add(myCookie); 
} 
} 
/// <summary> 
/// 取得CookieValue 
/// </summary> 
/// <param name="CookieName">Cookie名称</param> 
/// <returns>Cookie的值</returns> 
public static string GetCookie(string CookieName) 
{ 
HttpCookie myCookie = new HttpCookie(CookieName); 
myCookie = HttpContext.Current.Request.Cookies[CookieName]; 

if (myCookie != null) 
return myCookie.Value; 
else 
return null; 
} 
/// <summary> 
/// 清除CookieValue 
/// </summary> 
/// <param name="CookieName">Cookie名称</param> 
public static void ClearCookie(string CookieName) 
{ 
HttpCookie myCookie = new HttpCookie(CookieName); 
DateTime now = DateTime.Now; 

myCookie.Expires = now.AddYears(-2); 

HttpContext.Current.Response.Cookies.Add(myCookie); 
} 
} 
}