How to implement an interface class that will be implemented by student class

See more:

C#

I created an interface class called IStudentGrade that gets the student name and calculate the students grade. I also created a Student class that inherits Person class and implements the interface IStudentGrade class. How will I Implement IStudentGrade class from Student Class?

What I have tried:

namespace sample3
{
    interface IStudentGrade
    {
        string StudentName();
        int StudentGrade();
    }
}

namespace sample3
{
    public class Student : Person, IStudentGrade
    {
        public Student(string FirstName, string LastName, string Gender) 
            : base(FirstName, LastName, Gender)
        {
            Console.WriteLine(FirstName, LastName, Gender);
        }

          
     }
  }