Data was not updating the first time second time it is updating please rectify that problem

//Code for insert and update the data into database
private void btnAdvanceSave_Click(object sender, EventArgs e)
  {
  if (sanctiondateValidation() == false)
  return;
  try
  {
  string str = "Select SrlNo,EmpId,AdvanceType,AmountTaken,SanctionedDate,SanctionedBy from AdvancePaymentsMaster where EmpID='" + txtemployeeid.Text + "'and SanctionedDate=#"+dtpSanctionedDate.Value+"#";
  dbConnection conn = new dbConnection();
  OleDbDataReader  dr = conn.OleDbReaderQuery(str);
  if (dr.Read())
  {
   
  BOL.bolAdvancePaymentsMaster apm = new PayRoll.BOL.bolAdvancePaymentsMaster();
  //apm.AdvanceType = cmbAdvanceType.Text;
  apm.AdvanceType = cmbAdvanceType.Text;
  apm.AmountTaken = Convert.ToDecimal(txtAmountTaken.Text);
  apm.EmpID = txtemployeeid.Text;
  apm.SanctionedBy = txtSanctionedBy.Text;
  apm.SanctionedDate = Convert.ToDateTime(dtpSanctionedDate.Value);
  apm.Update();
  MessageBox.Show("Record updated sucessfully","Payroll",MessageBoxButtons.OK,MessageBoxIcon.Information );
  }
  else
  {
  BOL.bolAdvancePaymentsMaster apm1 = new PayRoll.BOL.bolAdvancePaymentsMaster();
  apm1.AdvanceType = cmbAdvanceType.Text;
  apm1.AmountTaken = Convert.ToDecimal(txtAmountTaken.Text);
  apm1.EmpID = txtemployeeid.Text;
  apm1.SanctionedBy = txtSanctionedBy.Text;
  apm1.SanctionedDate = Convert.ToDateTime(dtpSanctionedDate.Value);
  apm1.Insert();
  MessageBox.Show("Record Successfully Saved","Payroll",MessageBoxButtons.OK,MessageBoxIcon.Information );
  }
  dr.Close();
  loadAdvances();
  clearAdvances();
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message,"Payroll",MessageBoxButtons.OK,MessageBoxIcon.Information );
  }
  }

  //Code for Load Advances into gridview

  private void loadAdvances()
  {
  gvadvances.DataSource = null;
  //string str = "select EmpId as [Employee ID],AdvanceType as [Advance Type],AmountTaken as [Amount],Format(SanctionedDate,"dd-mm-yyyy") as [SDate],SanctionedBy as [Sanctioned By] from [AdvancePaymentsMaster] where EmpID='" + txtemployeeid.Text + "'";
  string str = "select EmpId as [Employee ID],AdvanceType as [Advance Type],AmountTaken as [Amount],Format(SanctionedDate,'dd-mm-yyyy') as [SDate],SanctionedBy as [Sanctioned By] from [AdvancePaymentsMaster] where EmpID='" + txtemployeeid.Text + "'";
  DataTable dt = conn.executeSelectQueryNonParameter(str);
  gvadvances.DataSource = dt;
  }
//Code for Bol database


public bool Update(BOL.bolAdvancePaymentsMaster obj)
    {
      dbConnection conn =new dbConnection();
  string sql = "update AdvancePaymentsMaster set AdvanceType=@AdvanceType,AmountTaken=@AmountTaken,SanctionedDate=@SanctionedDate,SanctionedBy=@SanctionedBy where EmpId=@EmpId and SanctionedDate=@SanctionedDate";
  OleDbParameter[] oledbParameters = new OleDbParameter[5];
  //sqlParameters[0] = new SqlParameter("@Srlno", SqlDbType.Int);
  //sqlParameters[0].Value = obj.Srlno;
  oledbParameters[0] = new OleDbParameter("@EmpId", OleDbType.VarChar);
  oledbParameters[0].Value = obj.EmpID;
  oledbParameters[1] = new OleDbParameter("@AdvanceType", OleDbType.VarChar);
  oledbParameters[1].Value = obj.AdvanceType;
  oledbParameters[2] = new OleDbParameter("@AmountTaken", OleDbType.Decimal);
  oledbParameters[2].Value = obj.AmountTaken;
  oledbParameters[3] = new OleDbParameter("#@SanctionedDate#", OleDbType.Date);
  oledbParameters[3].Value = obj.SanctionedDate;
  oledbParameters[4] = new OleDbParameter("@SanctionedBy", OleDbType.VarChar);
  oledbParameters[4].Value = obj.SanctionedBy;
  return conn.executeUpdateQuery(sql, oledbParameters);

    }
//code for insert the database

public bool executeInsertQuery(String _query, OleDbParameter[] sqlParameter)
  {
  OleDbCommand myCommand = new OleDbCommand();
  try
  {
  myCommand.Connection = openConnection();
  myCommand.CommandText = _query;
  myCommand.Parameters.AddRange(sqlParameter);
  myAdapter.InsertCommand = myCommand;
  myCommand.ExecuteNonQuery();
  }
  catch (OleDbException  e)
  {
  Console.Write("Error - Connection.executeInsertQuery - Query: " + _query + " \nException: \n" + e.StackTrace.ToString());
  return false;
  }
  finally
  {
 
  }
  return true;
  }