Add users to active directory

Check the below link.
https://stackoverflow.com/questions/2143052/adding-and-removing-users-from-active-directory-groups-in-net

To create a new user, follow these steps: Click Start, point to Administrative Tools, and then click Active Directory Users and Computers to start the Active Directory Users and Computers console. Click the domain name that you created, and then expand the contents. Right-click Users, point to New, and then click User

https://www.c-sharpcorner.com/article/active-directory-and-net/