Get menu item and bind it in dropdownlist in ASP.Net C#

Question

How to get Navigation Menu Item and binding it in Dropdown List using Asp.Net C#?

 

Example:

 

I have a Navigation Menu in that Masters Menu I have selected, in Masters menu it has 3 or more sub menus, while selecting one of the sub menu it should get bind in a dropdownlist of Web page. In that dropdownlist I need to get all sub menu item list.

 

 

If there's an solution please let me know it.