System.Data.DataColumn.FreeRecord C# (CSharp) Method

        internal void FreeRecord(int record)
        {
            Debug.Assert(null != _storage, "no storage");
            _storage.Set(record, _storage._nullValue);
        }

 internal void Clear(bool clearAll)
 {
     if (clearAll)
     {
         for (int record = 0; record < recordCapacity; ++record)
         {
             rows[record] = null;
         }
         int count = table.columnCollection.Count;
         for (int i = 0; i < count; ++i)
         {
             // SQLBU 415729: Serious performance issue when calling Clear()
             // this improves performance by caching the column instead of obtaining it for each row
             DataColumn column = table.columnCollection[i];
             for (int record = 0; record < recordCapacity; ++record)
             {
                 column.FreeRecord(record);
             }
         }
         lastFreeRecord = 0;
         freeRecordList.Clear();
     }
     else   // just clear attached rows
     {
         freeRecordList.Capacity = freeRecordList.Count + table.Rows.Count;
         for (int record = 0; record < recordCapacity; ++record)
         {
             if (rows[record] != null && rows[record].rowID != -1)
             {
                 int tempRecord = record;
                 FreeRecord(ref tempRecord);
             }
         }
     }
 }