Decimal to binary is a simple enough equation that you can create it yourself. Divide your decimal number by 2 and take the remainder. You can do this using the modulus (%) operator. Keep doing this until the decimal number = 0.
Code:
(int) BinaryMod = decimalNumber %2;
(String) BinaryDisplay += BinaryMod;
decimalNumber / 2;
In .NET you can use:
Code:
Convert.ToString(DecimalValue, 2).PadLeft(8, "0")
Where DecimalValue is your decimal number and 2 is your base. Using that function you can convert to any base.