C# Tutorial P10 - If statement

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using System;
class Program
{
    static void Main()
    {
        Console.WriteLine("Please enter a number");

        int UserNumber = int.Parse(Console.ReadLine());

        if (UserNumber == 1)
        {
            Console.WriteLine("Your number is one");
        }

        else if (UserNumber == 2)
        {
            Console.WriteLine("Your number is two");
        }

        else if (UserNumber == 3)
        {
            Console.WriteLine("Your number is three");
        }

        else        // if (UserNumber != 1 && UserNumber != 2 && UserNumber != 3)
        {
            Console.WriteLine("Your number is not between 1 and 3");
        }
    }
}

using System;
class Program
{
    static void Main()
    {
        Console.WriteLine("Please enter a number");

        int UserNumber = int.Parse(Console.ReadLine());

        if (UserNumber == 10 || UserNumber == 20)
        {
            Console.WriteLine("Your number is 10 or 20");
        }
    }
}