if (Request.Cookies["guid"] == null)
{
HttpCookie cookie = new HttpCookie("guid");
cookie.Value = Guid.NewGuid().ToString();
cookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);
}
Label1.Text = Request.Cookies["guid"].Value;参考资料
[1].HttpCookie类
：http://msdn.microsoft.com/zh-cn/library/system.web.httpcookie(VS.80).aspx
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