程序代码：HttpCookieCollection cookies = Request.Cookies;
DataRow dr = dt1.Rows[0];
string username = dr["username"].ToString().ToUpper();
//这里
Response.Cookies["huiyuan"]["huiyuanbianhao"] = username.Split('_')[0];
Session["huiyuanbianhao"] = username.Split('_')[0];
Response.Redirect("index.aspx");
DataRow dr = dt1.Rows[0];
string username = dr["username"].ToString().ToUpper();
//这里
Response.Cookies["huiyuan"]["huiyuanbianhao"] = username.Split('_')[0];
Session["huiyuanbianhao"] = username.Split('_')[0];
Response.Redirect("index.aspx");
跳转前 测试都还存在的
跳转后 Response.Cookies["huiyuan"]["huiyuanbianhao"] 为null