SPList list = SPContext.Current.Web.Lists[listName];
 SPView spview = list.Views["All Items"];
 SPQuery query = new SPQuery();
 query.Query = string.Concat(
                         "<Where><Eq>",
                                         "<FieldRef Name='ID'/>",
                                         "<Value Type='Integer'>" + the_Item_ID + "</Value>",
                                      "</Eq></Where>");

            foreach (string viewField in spview.ViewFields)
            {
                query.ViewFields += "<FieldRef Name='" + viewField + "' />";
            }
            query.ViewAttributes = "Scope="Recursive"";
            query.ViewFieldsOnly = true;

SPListItemCollection items list.GetItems(query);
SPListItem item = items[0];
//string title  = Convert.ToString(item["Title"]);// <-Fail, i don't know why
string title = Convert.ToString(item["LinkTitle"]); //<- pass

Guid id = item.UniqueId;//Fail, i don't know why

SPList list = SPContext.Current.Web.Lists[listName];
SPQuery query = new SPQuery();
query.Query = string.Concat(
                 "<Where><Eq>",
                                 "<FieldRef Name='ID'/>",
                                 "<Value Type='Integer'>" + the_Item_ID + "</Value>",
                              "</Eq></Where>");

//specify the field names that you want to use later on in the code
query.ViewFields = "<FieldRef Name='Title' /><FieldRef Name='LinkTitle' /><FieldRef Name='UniqueId' /><FieldRef Name='ID' />";

query.ViewAttributes = "Scope="Recursive"";
query.ViewFieldsOnly = true;

SPListItemCollection items list.GetItems(query);
SPListItem item = items[0];
string title  = Convert.ToString(item["Title"]);
string linkTitle = Convert.ToString(item["LinkTitle"]);

Guid id = item.UniqueId;

query.ViewFieldsOnly = true;