convert decimal to degre

can you solve this ?
I want to store second value in _Arr[3].
 public static string[] ConvertDecimaltoDegMin(float _value, string _LatorLong)
    {
        string[] _Arr = new string[4];

        string _LatLong = Convert.ToString(_value).Replace("-", "");
        string[] _DegMin = _LatLong.Split('.');
        if (_LatorLong == "LAT")
            if (_value < 0)
                _Arr[0] = "S";
            else
                _Arr[0] = "N";
        else if (_LatorLong == "LONG")
            if (_value < 0)
                _Arr[0] = "W";
            else
                _Arr[0] = "E";
        _Arr[1] = _DegMin[0];

        _Arr[2] = Math.Round((Math.Abs(_value) - Math.Truncate(Math.Abs(_value))) * 60).ToString();
        _Arr[3] = ?
}

Refer to this link

http://stackoverflow.com/questions/6862684/converting-from-decimal-degrees-to-degrees-minutes-seconds-tenths