C# Enum Grading System

enum Grade { //makes the enum for grading
    9 = A+, //grade level 9 = A+
    8 = A, //and so on...
    7 = B+,
    6 = B,
    5 = C+,
    4 = C,
    3 = D,
    2 = E,
    1 = F,
    0 = U
    }
static void Main(string[] args)
{
    Grade myGrade = 5; //standard grade is a 5/C+
    switch(myGrade) //changes the grade
    {
        case Grade.9: //if you get a 9...
            Console.WriteLine("You got an A+") //you get an a+
            break; //and that's it
        case Grade.8: //and so on...
            Console.WriteLine("You got an A")
            break;
        case Grade.7:
            Console.WriteLine("You got a B+")
            break;
        case Grade.6:
            Console.WriteLine("You got a B")
            break;
        case Grade.5:
            Console.WriteLine("You got a C+")
            break;
        case Grade.4:
            Console.WriteLine("You got a C")
            break;
        case Grade.3:
            Console.WriteLine("You got a D")
            break;
        case Grade.2:
            Console.WriteLine("You got an E")
            break;
        case Grade.1:
            Console.WriteLine("You got an F")
            break;
        case Grade.0:
            Console.WriteLine("You got an U")
            break;
    }
}