Error : Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

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C#

ASP.NET

entity-framework

public string UpdateStudent(tbl_Student objStudenttbl, tbl_Address objAddress,tbl_BranchAcademic objBranchAcademic)
      {

          context = new TMSEntities();

          using (TransactionScope myTran = new TransactionScope())
          {
              try
              {
          var currentacadyearID = (from acdYear in context.tbl_AcademicYear
          where acdYear.IsDefault == 1 &&acdYear.status.Equals("A")
          select acdYear.AcademicYearID).FirstOrDefault();
                  int cid = Convert.ToInt32(currentacadyearID);
                  int fid = Convert.ToInt32(objBranchAcademic.FinancialYearID);

                      var Stud = (from stud in context.tbl_Student
                                  where stud.StudentID == objStudenttbl.StudentID
                                  select stud).FirstOrDefault();
                      if (Stud != null)
                      {
                          Stud.Title = objStudenttbl.Title;
                          Stud.Firstname = objStudenttbl.Firstname;
                          Stud.Middlename = objStudenttbl.Middlename;
                          Stud.LastName = objStudenttbl.LastName;
                          Stud.MaritalStatus = objStudenttbl.MaritalStatus;
                          Stud.Gender = objStudenttbl.Gender;
                          Stud.AdmissionDate = objStudenttbl.AdmissionDate;
                          Stud.FYID = objStudenttbl.FYID;
                          Stud.UpdateBy = objStudenttbl.UpdateBy;
                          Stud.UpdateDateTime = objStudenttbl.UpdateDateTime;
                          Stud.DOB = objStudenttbl.DOB;
                          Stud.SEmail = objStudenttbl.SEmail;


                          var Add = (from add in context.tbl_Address
                                     where add.AddressID == Stud.AddressID
                                     select add).FirstOrDefault();
                          Add.Address1 = objAddress.Address1;
                          Add.Address2 = objAddress.Address2;
                          Add.CityID = objAddress.CityID;
                          Add.StateID = objAddress.StateID;
                          Add.ContactID = objAddress.CountryID;
                          Add.Landmark = objAddress.Landmark;
                          Add.Postalcode = objAddress.Postalcode;
                          Add.Street = objAddress.Street;



                      var BranchAcad = (from branchAcad in context.tbl_BranchAcademic
                                            where branchAcad.AcademicYearID == cid
                                            select branchAcad).FirstOrDefault();
                          BranchAcad.FinancialYearID = fid;
                          context.SaveChanges();
//context.ObjectStateManager.ChangeObjectState(BranchAcad, //System.Data.EntityState.Modified);
                          context.AcceptAllChanges();
                  }
                  saved = true;
              }
              catch (OptimisticConcurrencyException e)
              {

                  strMessage = "Data_update_error";
                  log.Error(e.Message);
              }
              catch (Exception ex)
              {
                  strMessage = "Data_update_error";
                  log.Error(ex.Message);
              }

              finally
              {
                  if (saved)
                  {
                      myTran.Complete();
                      context.AcceptAllChanges();
                      strMessage = "Data_update_success";
                      context.Dispose();
                  }
              }
          }
          return strMessage;
      }

I am using above code and error is thrown after context.SaveChanges() satatement.
I am using MySQL db.I throws OptimisticConcurrencyException.I have also added statement in code to resolve this problem. But problem is still there. Plz suggest any solution.Thanks in advance..