public virtual Column Build()
{
//if (title == null || sheetId == null || index == null)
//{
// throw new MemberAccessException("A title, sheetId, and index are required");
//}
Column column = new Column();
column.Id = id;
column.index = index;
column.title = title;
//column.sheetId = sheetId;
column.type = type;
column.options = options;
column.symbol = symbol;
column.systemColumnType = systemColumnType;
column.autoNumberFormat = autoNumberFormat;
column.width = width;
column.format = format;
column.locked = locked;
//column.ID = columnId;
return column;
}