How do I call webapi controller parameterized constructor using reprository and service

public class TestUsersUserControlController : ApiController
{
    private readonly IConnectUserRepository ConnectUserRepository;
       
    public TestUsersUserControlController()
    {
    }

public TestUsersUserControlController(IConnectUserRepository ConnectUserRepository)
{
    this.ConnectUserRepository = ConnectUserRepository;.........this parameterized constructor is not hitting and getting always null
}