asp.net uses .net controls to create drop-down navigation menus

asp.net uses .net controls to create drop-down navigation menus

Today’s small test is that the teacher asked us to use .NET controls to create a pull-down menu. The requirements are as follows:
Move the mouse to the parent menu to pop up 3 submenus. And each submenu has hyperlinks.

The following is the code I made myself:

ASP.NET uses .net controls to realize the production of drop-down navigation menu