Can class be empty (without any parametr) when this class extend another class?

Question

namespace FinalExam 
{ 
    class Developer 
    { 
        string name; 
        public void sayGoodMorning() 
        { 
            Console.Write("Good Morning! "); 
        } 
 
        public void sayHi() 
        { 
            Console.WriteLine("Hi!"); 
        } 
 
        public void startDiscussion() 
        { 
            Console.WriteLine("How is going your work?"); 
        } 
 
        public void setName(string a) 
        { 
            name = a; 
        } 
 
        public void getName() 
        { 
            Console.WriteLine(name);  
        } 
    } 
    class BackEnd : Developer 
    { 
 
    } 
    class FrontEnd : Developer 
    { 
 
    } 
    class FrontEndBackEndTest 
    { 
        static void Main(string[] args) 
        { 
            Developer Zaur = new Developer(); 
            Zaur.sayGoodMorning(); 
 
            Console.WriteLine(); 
 
            BackEnd backEnd = new BackEnd(); 
            backEnd.setName("Ben"); 
            backEnd.sayGoodMorning(); 
            backEnd.getName(); 
             
            Console.WriteLine(); 
 
            FrontEnd frontEnd = new FrontEnd(); 
            frontEnd.setName("Jane"); 
            frontEnd.sayHi(); 
            frontEnd.startDiscussion(); 
 
 
 
        } 
    } 
} 

my class was like this(don't mind names or calling objects just for example) in this example must be write something in child class or can be empty?