Question

I found this code on-line I want to know what do pass in this program what is this output and input strings are ? I am passing input as a file name and output as path but it`s giving error.

private void EncryptFile(string inputFile, string outputFile)
{
    try
    {
        string password = @"myKey123"; // Your Key Here
        UnicodeEncoding UE = new UnicodeEncoding();
        byte[] key = UE.GetBytes(password);

        string cryptFile = outputFile;
        FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);

        RijndaelManaged RMCrypto = new RijndaelManaged();

        CryptoStream cs = new CryptoStream(fsCrypt,RMCrypto.CreateEncryptor(key, key),CryptoStreamMode.Write);

        FileStream fsIn = new FileStream(inputFile, FileMode.Open);

        int data;
        while ((data = fsIn.ReadByte()) != -1)
            cs.WriteByte((byte)data);

        fsIn.Close();
        cs.Close();
        fsCrypt.Close();
    }
    catch
    {
        MessageBox.Show("Encryption failed!", "Error");
    }
}

Answer 1

The outputFile parameter isn’t a path but rather the fully qualified file name that it needs to write to. An example way to call this code is:

EncryptFile(@"c:\temp\unencryptedfile.txt", @"c:\temp\encryptedfile.txt");

Barring that, replace the catch code with the following:

catch(Exception ex) {
  MessageBox.Show(ex.Message); // will show the top exception
  if (ex.InnerException != null) {
    MessageBox.Show(ex.InnerException.Message); // will show additional details if present
  }
}

---

side note: just so you know, the code you have leaks memory. You might want to investigate the using clause and look up which of the classes you are using implement IDisposable.