encrypt any file type in c#

[lildiapaz]

Hi, everyone

I'm developing a c# windows application that allows the user to encrypt any file type. i would like to encrypt the file using a powerful encrypting algorithm. I've tried to use the rinjael, triple des, but it doesn't seem to encrypt certain files at all. Can you please tell me what the problem is. I don't understand why this function doesn't work when I call it and encrypt the file. when I search for the file it still pulls up when I search the harddrive and I'm still able to open the file. Can someone please help?

here's what i tried:

private void button3_Click(object sender, EventArgs e)
        {
            // Must be 64 bits, 8 bytes.
 
            try
            {
                string filePath = Path.Combine(currentFolderPath,
                    textBox3.Text);
                TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider();
               MessageBox.Show("Warning! By deleting a file it can cause other programs to not function properly!");
 
                string query = "Are you sure you want to delete the file\n" + filePath + "?";
                if (MessageBox.Show(query,
                    "Delete File?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                {
                    // Remove the Key from memory. 
 
                    File.Delete(filePath); //doesn't delete  from computer (Any help?)                             
                    File.Encrypt(filePath); //doesn't encrypt properly (Any help?)
                   EncryptFile(filePath, filePath, key, key); //not sure how to call this               
                    DisplayFolderList(currentFolderPath);
                    string query_two = "Would you like to delete another file\n";
                    if (MessageBox.Show(query_two,
                    "Restart?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                        Application.Restart();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unable to delete file. The following exception"
                    + " occurred:\n" + ex.Message, "Failed");
            }        
        }

//encryption function

 void EncryptFile(string sInputFilename, string sOutputFilename, string sKey, string sIV)
        {
            Rijndael rijndaelAlg = Rijndael.Create();
            //  rijndaelAlg.Key = some_key_val;
            //  rijndaelAlg.IV = some_iv_val;
            //  rijndaelAlg.KeySize = 256; // other valid key sizes: 128 or 192 (defaults to 256)
 
 
            //Set secret key For AES algorithm.
            rijndaelAlg.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            //Set initialization vector.
            rijndaelAlg.IV = ASCIIEncoding.ASCII.GetBytes(sIV);
            FileStream fsPlaintext = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read);
            FileStream fsCiphertext = new FileStream(sOutputFilename, FileMode.Create, FileAccess.Write);
            //Create an AES encryptor from the AES instance.
            ICryptoTransform aesencrypt = rijndaelAlg.CreateEncryptor();
 
            //Create crypto stream set to read and do an AES encryption transform on incoming bytes.
            CryptoStream cipherstream = new CryptoStream(fsCiphertext, aesencrypt, CryptoStreamMode.Write);
            byte[] bytearrayinput = new byte[fsPlaintext.Length];
            fsPlaintext.Read(bytearrayinput, 0, bytearrayinput.Length);
            cipherstream.Write(bytearrayinput, 0, bytearrayinput.Length);
            cipherstream.Close();
            fsPlaintext.Close();
            fsCiphertext.Close();
        }