Decrypting string using ASP.Net encrypted by Php

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I am encrypting My data in PHP like this :\[code\]$encrypted_string = mcrypt_encrypt(MCRYPT_DES, 'abcdefgh' , $input, MCRYPT_MODE_CBC, 'qwerasdf' );$encrypted_string = base64_encode($encrypted_string);return $encrypted_string;\[/code\]And Decrypting the Same in C# like this :\[code\]public string Decrypt(string input){ input = Server.UrlDecode(input); byte[] binary = Convert.FromBase64String(input); input = Encoding.GetEncoding(28591).GetString(binary); DES tripleDes = DES.Create(); tripleDes.IV = Encoding.ASCII.GetBytes("NAVEEDNA"); tripleDes.Key = Encoding.ASCII.GetBytes("abcdegef"); tripleDes.Mode = CipherMode.CBC; tripleDes.Padding = PaddingMode.Zeros; ICryptoTransform crypto = tripleDes.CreateDecryptor(); byte[] decodedInput = Decoder(input); byte[] decryptedBytes = crypto.TransformFinalBlock(decodedInput, 0, decodedInput.Length); return Encoding.ASCII.GetString(decryptedBytes);}public byte[] Decoder(string input){ byte[] bytes = new byte[input.Length / 2]; int targetPosition = 0; for (int sourcePosition = 0; sourcePosition < input.Length; sourcePosition += 2) { string hexCode = input.Substring(sourcePosition, 2); bytes[targetPosition++] = Byte.Parse(hexCode, NumberStyles.AllowHexSpecifier); } return bytes;}\[/code\]When I am trying to decrypt the string in C# it is throwing following exception :Input string was not in a correct format. At the Following Line : Byte.Parse(hexCode, NumberStyles.AllowHexSpecifier);Any idea how to What wrong I am doing ?