System.Data.ProviderBase.SchemaMapping.AddRelation C# (CSharp) Method

        private void AddRelation(DataColumn parentChapterColumn, DataColumn chapterColumn)
        {
            if (null != _dataSet)
            {
                string name = /*parentChapterColumn.ColumnName + "_" +*/ chapterColumn.ColumnName;

                DataRelation relation = new DataRelation(name, new DataColumn[] { parentChapterColumn }, new DataColumn[] { chapterColumn }, false);

                int index = 1;
                string tmp = name;
                DataRelationCollection relations = _dataSet.Relations;
                while (-1 != relations.IndexOf(tmp))
                {
                    tmp = name + index;
                    index++;
                }
                relation.RelationName = tmp;
                relations.Add(relation);
            }
        }