System.Data.DataColumnCollection.RegisterColumnName C# (CSharp) Method

        internal void RegisterColumnName(string name, DataColumn column)
        {
            Debug.Assert(name != null);

            try
            {
                _columnFromName.Add(name, column);

                if (null != column)
                {
                    column._hashCode = _table.GetSpecialHashCode(name);
                }
            }
            catch (ArgumentException)
            {
                // Argument exception means that there is already an existing key
                if (_columnFromName[name] != null)
                {
                    if (column != null)
                    {
                        throw ExceptionBuilder.CannotAddDuplicate(name);
                    }
                    else
                    {
                        throw ExceptionBuilder.CannotAddDuplicate3(name);
                    }
                }
                throw ExceptionBuilder.CannotAddDuplicate2(name);
            }

            // If we're adding a child table, then update defaultNameIndex to avoid colisions between the child table and auto-generated column names
            if ((column == null) && NamesEqual(name, MakeName(_defaultNameIndex), true, _table.Locale) != 0)
            {
                do
                {
                    _defaultNameIndex++;
                } while (Contains(MakeName(_defaultNameIndex)));
            }
        }