一、创建cookie，并写入数据：

   //创建、写入Cookie
    HttpCookie cookie = Request.Cookies["MWS_User"];
    if (cookie == null)
    ...{
          cookie = new HttpCookie("MWS_User");
    }
    cookie.Values.Set("UserID", strUserID);
    Response.SetCookie(cookie);
 

二、读取cookie：

HttpCookie cookie = Request.Cookies["MWS_User"];
if (cookie != null && cookie["UserID"].ToString() != "")
...{
      Response.Write("cookie=" + cookie["UserID"].ToString());
 }