pasa 110011000 a decimal

lic static string toDecimal(string binary)
{
    string decimal = "";
    for (int i = 0; i < binary.Length; i++)
    {
        if (binary[i] == '1')
        {
            decimal += "1";
        }
        else
        {
            decimal += "0";
        }
    }
    return decimal;
}

public static string toBinary(string decimal)
{
    string binary