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

        internal void AddDependentColumn(DataColumn expressionColumn)
        {
            if (_dependentColumns == null)
            {
                _dependentColumns = new List<DataColumn>();
            }

            if (!_dependentColumns.Contains(expressionColumn))
            {
                // only remember unique columns but expect non-unique columns to be added
                _dependentColumns.Add(expressionColumn);
            }
        }