C#

Hi,<br />
<br />
Have you tried to implement this using attributes and MessageSinks?  I think something like the following would be a lot easier.  <br />
<br />
class Example<br />
{<br />
    public Example(){}<br />
<br />
    [Precondition(y != 0)]<br />
    public int Divide(int x, int y)<br />
    {<br />
        return x / y;<br />
    }<br />
} 

<br />
 //Create the file streams to handle the input and output files.<br />
						    FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);<br />
						    FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);<br />
						    fout.SetLength(0);<br />
						    //Create variables to help with read and write.<br />
						    byte[] bin = new byte[buffersize]; //This is intermediate storage for the encryption.<br />
						    long rdlen = 0;              //This is the total number of bytes written.<br />
						    long totlen = fin.Length;    //This is the total length of the input file.<br />
						    int len;                     //This is the number of bytes to be written at a time.<br />
						    //<br />
						    RC2CryptoServiceProvider RC2 = new RC2CryptoServiceProvider(); <br />
							//<br />
							//byte[] prndKey = new byte[]{0x00, 0x74,0xBa,0x12,0x54,0x11,0x75,0x91,0x12,0x71,0x15};<br />
							PasswordDeriveBytes db = new PasswordDeriveBytes(KeySecretString,SaltByte);<br />
							byte[] f= db.GetBytes(RC2.LegalKeySizes[0].MaxSize /16);<br />
							//<br />
							RC2.IV = f;			<br />
							RC2.Key =f;<br />
						    CryptoStream encStream = new CryptoStream(fout, RC2.CreateDecryptor(RC2.Key, RC2.IV), CryptoStreamMode.Write);        <br />
						    Console.WriteLine("Encrypting...");<br />
						    //Read from the input file, then encrypt and write to the output file.<br />
						    while(rdlen < totlen)<br />
						    {<br />
						        len = fin.Read(bin, 0, buffersize);<br />
						        encStream.Write(bin, 0, len);<br />
						        rdlen = rdlen + len;<br />
						    	PD.PerformStep();<br />
						        Console.WriteLine("{0} bytes processed", rdlen);<br />
						    } <br />