For some reason I considered the following as an improvement as well:
switch(n)
{
case 1:
cost += 25;
break;
case 2:
cost += 25;
goto case 1;
case 3:
cost += 25;
goto case 2;
default:
Console.WriteLine("Invalid selection. Please select 1, 2, or 3.");
break;
}
Where's that morning coffee...