Web web = ctx.Web;
                List list = web.Lists.GetById(new Guid("fe15d182-4e65-48a9-a613-6dcfae756c69"));
                var q = new CamlQuery() { ViewXml = "<View><Query><Where><Eq><FieldRef Name='Manager' /><Value Type='User'>TOM</Value></Eq></Where></Query></View>" };
                var r = list.GetItems(q);
                ctx.Load(r);


                string result = string.Empty;
                foreach (SPclient.ListItem itm in r)
                {
                    FieldUserValue name = itm.FieldValues["Manager"] as FieldUserValue;
                    string person = name.LookupValue;
                    //Console.WriteLine(itm.Id + "     " + itm["Manager"].ToString() + "     " + person);

                    MessageBox.Show(itm.Id + "     " + itm["Title"].ToString() + "     " + multitextValue + "    " + person);
                }