มือใหม่กับคำสั่ง switch C# error a constant value is expect.

int myValue = 2;

switch (myValue) {
    case 1:
             2:
             3:
        Console.WriteLine("1-3");
        break;
    case 4:
             5:
             6:
             7:
        Console.WriteLine("4-7");
        break;
    case 10:
    default:
        break;
}

            int myValue = 2;

            if ((myValue = 1) && (myValue <= 3)){
                Console.WriteLine("1-3");
            }
            else if ((myValue == 4) && (myValue <= 7)){
                Console.WriteLine("4-7");
            } else if (myValue==  10) {

            }
            else {
                
            }