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

        internal void ResetInternalIndexes(DataColumn column)
        {
            Debug.Assert(null != _indexes, "unexpected null indexes");
            SetShadowIndexes();
            try
            {
                // the length of shadowIndexes will not change
                // but the array instance may change during
                // events during Index.Reset
                int numIndexes = _shadowIndexes.Count;
                for (int i = 0; i < numIndexes; i++)
                {
                    Index ndx = _shadowIndexes[i];// shadowindexes may change, see ShadowIndexCopy()
                    if (0 < ndx.RefCount)
                    {
                        if (null == column)
                        {
                            ndx.Reset();
                        }
                        else
                        {
                            bool found = false;
                            foreach (IndexField field in ndx._indexFields)
                            {
                                if (ReferenceEquals(column, field.Column))
                                {
                                    found = true;
                                    break;
                                }
                            }
                            if (found)
                            {
                                ndx.Reset();
                            }
                        }
                    }
                }
            }
            finally
            {
                RestoreShadowIndexes();
            }
        }