Denary to binary

// Denary to binary program

using System;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static string den_to_bin(int number)
    {
        string binary = "";
        while (number > 0)
        {
            int remainder = number % 2;
            binary = Convert.ToString(remainder) + binary;
            number = number / 2;
        }
        return binary;
    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        Console.WriteLine("Enter the denary number to convert:");
        int number = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("Binary: " + den_to_bin(number));
    }

}