DateTime dt = DateTime.Now;
                System.Web.HttpCookie mycookie = new HttpCookie("logname");//创建cookie对象
                mycookie.Value = TB_UserName.Text;//为“logname”的值 
                mycookie.Name = "pwd";//另一个键 
                mycookie.Value = TB_Password.Text;//另一个值 
                mycookie.Expires = Convert.ToDateTime(dt + TimeSpan.FromDays(365));//设定过期时间为1年
                Response.Cookies.Add(mycookie);//写入COOKIE 
之后在写一下代码：
      System.Web.HttpCookie cook = Request.Cookies["logname"];
            System.Web.HttpCookie cook1 = Request.Cookies["pwd"];
            //System.Web.HttpCookie cook2 = Request.Cookies["pwd"];
            string name = cook.Value.ToString();
            string pwd = cook1.Value.ToString();
          
            Response.Write(name + "\n");
            Response.Write(pwd);