using System.Windows.Forms;
using System.Speech.Synthesis;

namespace Sample
{
 public partial Class Form1: Form
 {
  public SpeechSynthesizer _synthesizer;
  private void btnSpeak_Click(object sender, EventArgs e)
  {
   _synthesizer = new SpeechSynthesizer();
   var words = txtWords.Text;
   _synthesizer.Speak(words);
  }
  public Form1()
  {
   InitializeComponent();
  }
 }
}