Convert input from control to upper case

   
 
using System;

public class MainClass {
    static void Main() {
        Console.WriteLine("Enter command:");
        string resp = (Console.ReadLine()).ToLower();
        switch (resp) {
            case "a":
                Console.WriteLine("Doing Task A");
                break;
            case "b":
                Console.WriteLine("Doing Task B");
                break;
            case "c":
                Console.WriteLine("Doing Task C");
                break;
            default:
                Console.WriteLine("Bad choice");
                break;
        }
    }
}