speech to text convertor

using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Speech.Synthesis;
using System.Windows.Forms;

namespace tts
{
    public partial class Form1 : Form
    {
        SpeechSynthesizer speak = new SpeechSynthesizer();
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == null)
            {
                MessageBox.Show("please! enter some text in box");
            }
            speak.Volume = trackBar2.Value * 10;
            speak.SelectVoiceByHints(VoiceGender.Male);
            speak.Rate= trackBar1.Value;
         
          
                     speak.Speak(textBox1.Text);
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
          
            speak.Rate = trackBar1.Value;
            speak.Volume = trackBar2.Value * 10;

           speak.SelectVoiceByHints(VoiceGender.Female);
            speak.Speak(textBox1.Text);
           
        }

        private void button3_Click(object sender, EventArgs e)
        {
            OpenFileDialog op = new OpenFileDialog();
            op.Title = "open a text file";
            op.Filter = "text files|*.txt";
            op.ShowDialog();
            textBox1.Text = File.ReadAllText(op.FileName);
            
        }

       
                     private void button6_Click(object sender, EventArgs e)
        {
            SaveFileDialog sv = new SaveFileDialog();
            
                sv.Filter = "wav files|*.wav";
                sv.Title = ("save file as .wav");
                sv.ShowDialog();
                if (sv.ShowDialog() == DialogResult.OK)
                {
                    speak.SetOutputToWaveFile(sv.FileName);
                    speak.SpeakAsync(textBox1.Text);


                }
            
        }

        
    }
}