Is is possible to make a DES/Triple DES file encrypter

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C#

encryption

I am trying to make a DES and triple DES file encrypter i cant find any articles or videos on DES file encryption which is why i asked my question. I have tried the following code but i get invalided key error and it doesn't matter if i change the IV from 16 to 8 i still get this error.

The code i tried:

private void TDES_EncryptFile()
       {
           Stream myStream;
           SaveFileDialog saveFileDialog1 = new SaveFileDialog();
           saveFileDialog1.Filter = "Encrypted File (*.enc)|*.enc";
           saveFileDialog1.RestoreDirectory = true;

           if (saveFileDialog1.ShowDialog() == true)
           {
               if ((myStream = saveFileDialog1.OpenFile()) != null)
                   myStream.Close();

               string keyText = keys2.Text;
               byte[] keyBytes = ASCIIEncoding.ASCII.GetBytes(keyText);
               byte[] ivBytes = ASCIIEncoding.ASCII.GetBytes(keyText);
               string inputFile = Openfile.Text;
               string encryptedFile = saveFileDialog1.FileName;
               using (FileStream inputFileStream = File.Open(inputFile, FileMode.Open))
               using (FileStream outputFileStream = File.Open(encryptedFile, FileMode.Create))
               {
                   using (TripleDESCryptoServiceProvider tds = new TripleDESCryptoServiceProvider())
                   {
                       tds.Key = keyBytes;
                       tds.IV = ivBytes;

                       ICryptoTransform cryptoTransform = tds.CreateEncryptor();

                       using (CryptoStream cryptoStream = new CryptoStream(outputFileStream, cryptoTransform, CryptoStreamMode.Write))
                       {
                           byte[] buffer = new byte[inputFileStream.Length];
                           inputFileStream.Read(buffer, 0, buffer.Length);
                           cryptoStream.Write(buffer, 0, buffer.Length);
                           MessageBox.Show("The File Was Successfully Encrypted", "Encrypted!", MessageBoxButton.OK, MessageBoxImage.Information);
                       }
                   }
               }
           }
       }