Saving records multiple times

private int _saveRecord()
   {
       string _tableName = DBStructure.TABLE_SITE_POWER_PLANT_MASTER;
       int _retVal = -1;
       int _errorCode = (int)ErrorCodes.NoError;
       try
       {
           if (PowerPlantTable.Rows.Count > 0)
           {
               foreach (DataRow _dr in PowerPlantTable.Rows)
               {

                   RecordValues[] _newRec = new RecordValues[6];

                   _newRec[0].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_POWER_PLANT_ID;
                   _newRec[0].FieldType = Fieldtypes.Integer;
                   _newRec[0].FieldValue = _dr["Power Plant"].ToString();

                   _newRec[1].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_METER_SLAVE_ID;
                   _newRec[1].FieldType = Fieldtypes.Integer;
                   _newRec[1].FieldValue = _dr["DC Meter"].ToString();

                   _newRec[2].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_CHANNEL_ID;
                   _newRec[2].FieldType = Fieldtypes.Integer;
                   _newRec[2].FieldValue = _dr["Channel ID"].ToString();

                   _newRec[3].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_CREATED_BY;
                   _newRec[3].FieldType = Fieldtypes.VarChar;
                   _newRec[3].FieldValue = UserName.ToString();

                   _newRec[4].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_CREATED_DATE;
                   _newRec[4].FieldType = Fieldtypes.Int;
                   _newRec[4].FieldValue = UpdatedTime.ToString();

                   _newRec[5].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_SITE_ID;
                   _newRec[5].FieldType = Fieldtypes.Integer;
                   _newRec[5].FieldValue = SiteID.ToString();

                   if (_dr["SiteID"].ToString().Equals("0"))
                   {
                       _retVal = _dalAccess.Insert(false, _tableName, _newRec, out _errorCode);

                       if (_errorCode == (int)ErrorCodes.NoError)
                       {
                           StatusDescription = GetGlobalResourceObject(globalResourceFileName, "InsertedSucessfully").ToString();
                       }
                       else
                           StatusDescription = _errorLogger.GetErrorMessage(_errorCode);
                   }
                   else
                   {
                       cndCheck[] _whClause = new cndCheck[1];
                       _whClause[0].FieldName = DBStructure.SITE_POWER_PLANT_MASTER_SITE_ID;
                       _whClause[0].FieldType = Fieldtypes.Integer;
                       _whClause[0].FirstFieldValue = _dr["SiteID"].ToString();
                       _whClause[0].ArithmeticOp = ArithmeticOperator.EQUALS;

                       _retVal = _dalAccess.Update(false, _tableName, _newRec, _whClause, out _errorCode);
                       if (_errorCode == (int)ErrorCodes.NoError)
                       {
                           StatusDescription = GetGlobalResourceObject(globalResourceFileName, "UpdatedSuccessfully").ToString();
                       }
                       else
                           StatusDescription = _errorLogger.GetErrorMessage(_errorCode);
                   }
               }
           }
           else
           {
               StatusDescription = GetGlobalResourceObject(ResorceFileName, "PowerPlantNotExists").ToString();
           }
           return _retVal;
       }
       catch (Exception ex)
       {
           _errorLogger.PrintUnknownError(ex.Message.ToString(), GetModuleName(), _getPageName(), "_saveRecord()");
           return -1;
       }
   }

private void _updateToDataTable(int _rowIndex)
   {
       try
       {
           bool blCheck = _checkEditData(_rowIndex);
           if (blCheck)
           {
           PowerPlantTable.Rows[_rowIndex].BeginEdit();
           DataRow dr = PowerPlantTable.Rows[_rowIndex];

           dr["Power Plant"] = cmbPowerPlant.SelectedItem.Text;
           dr["DC Meter"] = cmbDcMeter.SelectedItem.Text;
           dr["Channel ID"] = cmbChannel.SelectedItem.Text;

           ViewState.Remove("rowIndex");
           PowerPlantTable.AcceptChanges();

           wbtnSave.Text = GetGlobalResourceObject(globalResourceFileName, "lnkAdd").ToString();
           wbtnSave.ToolTip = GetGlobalResourceObject(globalResourceFileName, "lnkAddToolTip").ToString();
           _setPageAccessibilty();
           _clearControls();
       }
           else
           {
               StatusDescription = GetGlobalResourceObject(ResorceFileName, "PPExists").ToString();
           }
       }

       catch (Exception Ex)
       {
           _errorLogger.PrintUnknownError(Ex.Message, GetModuleName(), _getPageName(), "_updateToDataTable()");
       }
   }