DES encryption, (c#) and mcrypt (php)

I have a problem trying to encrypt a string in PHP and also in C# using DES (cbc) encryption. The problem I'm facing is that I'm getting different results using the different languages.


In C#:
SymmetricAlgorithm objCryptoService = (SymmetricAlgorithm)new DESCryptoServiceProvider();
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream, objCryptoService.CreateEncryptor(StringToBytes.ConvertHex("0F26EF560F26EF56"), StringToBytes.ConvertHex("0F26EF560F26EF56")), CryptoStreamMode.Write);
StreamWriter writer = new StreamWriter(cryptoStream);
writer.Write("My Secret Text");
writer.Flush();
cryptoStream.FlushFinalBlock();
writer.Flush();
Response.Write("Encrypted=" + Convert.ToBase64String(memoryStream.GetBuffer(), 0, (int)memoryStream.Length));


Public static class StringToBytes< ...