private void OptionDecryptAES_Click(object sender, EventArgs e) { try { SymmetricCryptography decrypterAES = new SymmetricCryptography(true); string contentToDecrypt = UploadedDocumentClass.GetFileContent(); string decrypted = decrypterAES.DecryptDocumentAES(contentToDecrypt); LoadingScreenForm loadScreen = new LoadingScreenForm(UploadedDocumentClass.GetFileName(), "AES Decryption"); loadScreen.ShowDialog(); SaveToTxt("helpfile_aes_decrypted", decrypted); outputScreen.Text = "Decrypted with AES: \r\n" + decrypted; } catch { MessageBox.Show("Document is not valid AES encryption", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } }