C # DES encryption and decryption

Code

Public   Class Encryptdecrypt
{
Public   Static   String Encryptstring ( String MES, String Key)
{
Byte [] Inputbytes = Asciiencoding. utf8.getbytes (MES );

Memorystream outputstream =   New Memorystream ();
Descryptoserviceprovider des =   New Descryptoserviceprovider ();
Des. Key = Asciiencoding. ASCII. getbytes (key );
Des. iv = Asciiencoding. ASCII. getbytes (key );
Icryptotransform desencrypt = Des. createencryptor ();
Cryptostream =   New Cryptostream (outputstream, desencrypt, cryptostreammode. Write );
Cryptostream. Write (inputbytes, 0 , Inputbytes. Length );
Cryptostream. flushfinalblock ();
Cryptostream. Close ();

string outputstring = convert. tobase64string (outputstream. toarray ();
return outputstring;
}

Public Static StringDecryptstring (StringMES,StringKey)
{
Byte[] Inputbytes=Convert. frombase64string (MES );

Memorystream outputstream=   New Memorystream ();
Descryptoserviceprovider des =   New Descryptoserviceprovider ();
Des. Key = Asciiencoding. ASCII. getbytes (key );
Des. iv = Asciiencoding. ASCII. getbytes (key );
Icryptotransform desencrypt = Des. createdecryptor ();
Cryptostream =   New Cryptostream (outputstream, desencrypt, cryptostreammode. Write );
Cryptostream. Write (inputbytes, 0 , Inputbytes. Length );
Cryptostream. flushfinalblock ();
Cryptostream. Close ();

StringOutputstring=Asciiencoding. utf8.getstring (outputstream. toarray ());
ReturnOutputstring;
}
}