public ColumnWriter NextColumn()
 {
     return(ColumnWriter.Create(ExceptionInfo.Return <IntPtr>(_handle, RowGroupWriter_NextColumn), this, CurrentColumn));
 }
 public ColumnWriter Column(int i)
 {
     return(ColumnWriter.Create(ExceptionInfo.Return <int, IntPtr>(_handle, i, RowGroupWriter_Column), this, i));
 }