sorting Data table Without returning new dataTable

Question

Hi 

 I want to sort the Data Table according to specific query and returns the Original Data Table with sorted form.

Here is code i written but returns new data Table.

  

          m_dtCacheSource.DefaultView.Sort = "Size(KB) DESC";

            m_dtCacheSource                           = m_dtCacheSource.DefaultView.ToTable();

any idea how this proble will be solved ?