Cryptography толи я не такой, то ли лыжи не едут

using System; 
using System.Security.Cryptography; 
using System.IO; 
namespace testencryptdecrypt 
{ 
public class testit 
{ 
public testit() 
{ 
} 
public string encryptData(string inString, byte[] desKey, byte[] desIV, bool encrypt) 
{ 
DES des = new DESCryptoServiceProvider(); 
//RijndaelManaged des = new RijndaelManaged(); 
long rdlen = 0; 
int len; 
byte[] byteString = System.Text.Encoding.ASCII.GetBytes(inString.ToCharArray()); 
long totlen = byteString.Length; 
byte[] bin = new byte[100]; 
MemoryStream msIn=new MemoryStream(byteString); 
MemoryStream msOut=new MemoryStream(); 
CryptoStream encStream; 
if (encrypt) 
{ 
encStream = new CryptoStream(msOut, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write); 
} 
else 
{ 
encStream = new CryptoStream(msOut, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write); 
} 
while(rdlen < totlen) 
{ 
len = msIn.Read(bin, 0, 100); 
encStream.Write(bin, 0, len); 
rdlen = rdlen + len; 
} 
byte[] outArray=msOut.ToArray(); 
inString=System.Text.Encoding.ASCII.GetString(outArray, 0, outArray.Length); 
return inString; 
} 
public void test() 
{ 
// with common phrase and key 
string s='123What a very very very very very very long and beautiful day! Yea!'; 
string a=encryptData(s,System.Text.Encoding.ASCII.GetBytes('12345678'.ToCharArray()),System.Text.Encoding.ASCII.GetBytes('1234567890'.ToCharArray()),true); 
string b=encryptData(a,System.Text.Encoding.ASCII.GetBytes('12345678'.ToCharArray()),System.Text.Encoding.ASCII.GetBytes('1234567890'.ToCharArray()),false); 
Console.WriteLine('Origin is: '+s); 
Console.WriteLine('Encrypted is: '+'
'+a); 
Console.WriteLine('Decrypted is: '+'
'+b); 
// with special key 
byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}; 
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; 
a=encryptData(s,Key,IV,true); 
b=encryptData(a,Key,IV,false); 
Console.WriteLine('Origin is: '+s); 
Console.WriteLine('Encrypted is: '+'
'+a); 
Console.WriteLine('Decrypted is: '+'
'+b); 
// with short string 
s='Test'; 
a=encryptData(s,Key,IV,true); 
b=encryptData(a,Key,IV,false); 
Console.WriteLine('Origin is: '+s); 
Console.WriteLine('Encrypted is: '+'
'+a); 
Console.WriteLine('Decrypted is: '+'
'+b); 
} 
static void Main() 
{ 
testit ti=new testit(); 
ti.test(); 
} 
} 
}