public class Program

{

    public static void Main()

    {

    }                               

public static string ASCIIToDecimal(string str)

{

    string dec = string.Empty;

​

    for (int i = 0; i < str.Length; ++i)

    {

        string cDec = ((byte)str[i]).ToString();

​

        if (cDec.Length < 3)

            cDec = cDec.PadLeft(3, '0');

​

        dec += cDec;

    }

​

    return dec;

}

​

}