static void Main(string[] args)
{
GradeBook myGradeBook = new GradeBook();
Console.WriteLine("Initial course name is: '{0}'\n", myGradeBook.CourseName);
Console.WriteLine("Please enter the course name:");
myGradeBook.CourseName = Console.ReadLine();
Console.WriteLine("Initial instructor of the course is: '{0}'\n", myGradeBook.InstructorName);
Console.WriteLine("Please enter the instructor's name for the course:");
myGradeBook.InstructorName = Console.ReadLine();
Console.WriteLine();
myGradeBook.DisplayMessage();
}