TextBox value not updated - linq-to-sql

Question

I am fetching data from database to textbox using Linq.When i try update the same textbox value,it does not work.
DAL.TournamentsDataContext tdc = new SchoolSports.DAL.TournamentsDataContext();
var tournamentTable = tdc.GetTable<DAL.Tournament>();
var tournamentRecord = (from rec in tournamentTable
where rec.TournamentId == TournamentId
select rec).Single();
tournamentRecord.Tournament_type = Tournament_type;
tournamentRecord.Tournament_Name = Tournament_Name; ;
tournamentRecord.Tournament_Level = Tournament_Level;
tournamentRecord.Tournament_For = Tournament_For;
tournamentRecord.Country_Code = Country_Code;
tournamentRecord.Tournament_Status = Tournament_Status;
tournamentRecord.Tournament_begin_date = Tournament_begin_date;
tournamentRecord.Tournament_end_date = Tournament_end_date;
tournamentRecord.Sponsored_By = Sponsored_By;
tournamentRecord.Tournament_Details = Tournament_Details;
var organiserTable = tdc.GetTable<DAL.Organiser>();
var organiserRecord = (from rec in organiserTable
where rec.Tournament_Id == TournamentId
select rec).Single();
organiserRecord.Name_Of_Organiser = OrName;
organiserRecord.Telephone = OrTeleNo;
organiserRecord.Email = OrEmail;
organiserRecord.Mobile = OrMobile;
organiserRecord.Fax = OrFax;
if (Tournament_For == "School")
{
var invitedSchoolIdTable = tdc.GetTable<DAL.Invited_School>();
var invitedSchoolIdRecord = (from rec in invitedSchoolIdTable
where rec.Tournament_Id == TournamentId
select rec).Single();
invitedSchoolIdRecord.School_Ids = SchoolUniIds;
}
if (Tournament_For == "University")
{
var invitedUniversityTable = tdc.GetTable<DAL.Invited_University>();
var invitedUniversityIdRecord = (from rec in invitedUniversityTable
where rec.Tournament_Id == TournamentId
select rec).Single();
invitedUniversityIdRecord.University_Ids = SchoolUniIds;
}
tdc.SubmitChanges();

Answer 1

(The following answer was written before he updated the question)
If you want the value to be updated with the value in the text box, the text box must be bound to a datasource

Answer 2

I have solved using IsPostBack in Page_Load Event.