private void btnEncrypt_Click(object sender, EventArgs e) { var plainTextFilePath = txtPlainTextFile.Text; if (!File.Exists(plainTextFilePath)) { return; } if (txtKey.Text.Trim().Length == 0) { return; } var key = txtKey.Text.Trim(); const string targetDirectory = @"C:\Users\Barry\Documents\My Dropbox\Deployment\LA3_Data"; var encryptedFilename = string.Format("LA3_Data_{0}.enc", DateTime.Now.ToString("yyyyMMddHHmmss")); var encryptFile = Symmetric.EncryptFile(plainTextFilePath, key, targetDirectory, encryptedFilename); txtKey.Text = ""; MessageBox.Show(string.Format("File encrypted to [{0}]", encryptFile), @"Encrypted", MessageBoxButtons.OK, MessageBoxIcon.Information); }