public void RegisterStudent()
{
Console.WriteLine("Registering of a new student");
Console.Write("Type his/her name : ");
string name = Console.ReadLine();
Console.Write("Type his/her adress : ");
string adress = Console.ReadLine();
Console.Write("Type his/her phone number : ");
string phoneNumber = Console.ReadLine();
Console.Write("Type his/her email : ");
string email = Console.ReadLine();
Console.Write("Type his/her password : "******"Type the name of his/her branch : ");
string branchName = Console.ReadLine();
Console.Write("Type the number of payments : ");
int nbrPayment = Convert.ToInt32(Console.ReadLine());
int index = Branches.IndexOfKey(branchName);
Branche branche = Branches.ElementAt(index).Value;
Student student = new Student(name, adress, phoneNumber, email, password, branche, nbrPayment, 0, 0, 0, AllCourses[index], AllCourses[index].Count);
AllStudents.Add(student);
}