System.Data.DataTable.InsertRow C# (CSharp) Method

        internal void InsertRow(DataRow row, long proposedID, int pos, bool fireEvent)
        {
            Exception deferredException = null;

            if (row == null)
            {
                throw ExceptionBuilder.ArgumentNull(nameof(row));
            }
            if (row.Table != this)
            {
                throw ExceptionBuilder.RowAlreadyInOtherCollection();
            }
            if (row.rowID != -1)
            {
                throw ExceptionBuilder.RowAlreadyInTheCollection();
            }
            row.BeginEdit(); // ensure something's there.            

            int record = row._tempRecord;
            row._tempRecord = -1;

            if (proposedID == -1)
            {
                proposedID = _nextRowID;
            }

            bool rollbackOnException;
            if (rollbackOnException = (_nextRowID <= proposedID))
            {
                _nextRowID = checked(proposedID + 1);
            }

            try
            {
                try
                {
                    row.rowID = proposedID;
                    // this method may cause DataView.OnListChanged in which another row may be added
                    SetNewRecordWorker(row, record, DataRowAction.Add, false, false, pos, fireEvent, out deferredException); // now we do add the row to collection before OnRowChanged (RaiseRowChanged)
                }
                catch
                {
                    if (rollbackOnException && (_nextRowID == proposedID + 1))
                    {
                        _nextRowID = proposedID;
                    }
                    row.rowID = -1;
                    row._tempRecord = record;
                    throw;
                }

                // since expression evaluation occurred in SetNewRecordWorker, there may have been a problem that
                // was deferred to this point.  If so, throw now since row has already been added.
                if (deferredException != null)
                    throw deferredException;

                if (EnforceConstraints && !_inLoad)
                {
                    // if we are evaluating expression, we need to validate constraints
                    int columnCount = _columnCollection.Count;
                    for (int i = 0; i < columnCount; ++i)
                    {
                        DataColumn column = _columnCollection[i];
                        if (column.Computed)
                        {
                            column.CheckColumnConstraint(row, DataRowAction.Add);
                        }
                    }
                }
            }
            finally
            {
                row.ResetLastChangedColumn();// if expression is evaluated while adding, before  return, we want to clear it
            }
        }

 public void InsertAt(DataRow row, int pos)
 {
     if (pos < 0)
     {
         throw ExceptionBuilder.RowInsertOutOfRange(pos);
     }
     if (pos >= list.Count)
     {
         table.AddRow(row, -1);
     }
     else
     {
         table.InsertRow(row, -1, pos);
     }
 }