C# Case Sensitivity in Switch-statement

Question

I'm working a little with switch statements and want to know how to ignore the case sensitivity when it comes to input values.

Here is my code:

using System;

namespace SwitchStatements
{
class MainClass
{
    public static void Main(string[] args)
    {
    Start:
        Console.WriteLine("Please Input the Grade");
        char grade = Convert.ToChar(Console.ReadLine());

        switch (grade)
        {
            case 'A':
                Console.WriteLine("Excellent Work!");
                break;
            case 'B':
                Console.WriteLine("Very Good Effort! Just a couple of     Errors =)");
                break;
            case 'C':
                Console.WriteLine("You Passed. Push Yourself Next Time");
                break;
            case 'D':
                Console.WriteLine("Better put in more effort next time. I know you can do better");
                break;
            default:
                Console.WriteLine("Invalid Grade.");
                break;
        }
        Console.ReadKey();
        goto Start;
    }
}
}

If I put 'a' in instead of 'A' it returns the default response.

Can I use perhaps a .Comparison of some sort? If so where would I put it?

Answer 1

You can use ConsoleKey as condition for switch, the code will be like the following.

var grade =Console.ReadKey().Key;
switch (grade)
{
    case ConsoleKey.A:
        Console.WriteLine("Excellent Work!");
        break;
    case ConsoleKey.B:
        // Something here
        break;    
    case ConsoleKey.C:
        // Something here
        break;

    case ConsoleKey.D:
        // Something here
        break;          
    case ConsoleKey.E:
       // Something here
        break;             
    default:
       // Something here
        break;
}

So that you can avoid converting the input to uppercase/Lower case, and then it goes for another conversion To Char. Simply use ConsoleKey Enumeration inside the switch.

Answer 2

You can use ToUpper(); Like

Convert.ToChar(Console.ReadLine().ToUpper());

and to get saved from the error of getting more charaters with Console.ReadLine() you can use

char grd = Convert.ToChar(Console.ReadKey().KeyChar.ToString().ToUpper());