C#

public String ConvertToBase(int num, int nbase)
        {
            String chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

            // check if we can convert to another base
            if (nbase < 2 || nbase > chars.Length)
                return "";

            int r;
            String newNumber = "";

            // in r we have the offset of the char that was converted to the new base
            while (num >= nbase)
            {
                r = num % nbase;
                newNumber = chars[r] + newNumber;
                num = num / nbase;
            }
            // the last number to convert
            newNumber = chars[num] + newNumber;

            return newNumber;
        }

const string chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static readonly int num_chars = chars.Length;

static string NumberToCode(int number)
{
  if (number < 0 || number > num_chars * num_chars)
    throw new ArgumentOutOfRangeException();

  return chars[number / num_chars].ToString() + chars[number % num_chars];
}

static public string EncodeTo64(string toEncode)
{
    byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
    string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
    return returnValue;
}

static public string DecodeFrom64(string encodedData)
{
    byte[] encodedDataAsBytes = System.Convert.FromBase64String(encodedData);
    string returnValue = System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
    return returnValue;
}

Collin Jasnoch wrote:

its "a module"