It has been several years since I entered the IT industry. From the earliest contact with pb6.0 to the present .net technology, computer technology has made great progress in both hardware and software. The overall level of Chinese programmers is also far behind in the world. The lack of a complete system, necessary communication and the idea of programmers' personal heroism are the main reasons. Not long ago, I encountered a problem in using datagrid to display data in classification. The display style is shown in the figure below: I hope to provide a solution for friends who encounter similar problems and master solutions to similar problems.