The SoundPlayer class is new to the .net framework, version 2.0. It provides the StartAsync and Stop methods. Put it as a variable in the SaveStop_Click and the Read_Click voids, and instantiate it. Then, just call the methods. Overall, it would look like this:
private void SaveStop_Click(object sender, EventArgs e)
{
//Your mciSendString stuff goes here
SoundPlayer player = new SoundPlayer();
player.Stop();
}
private void Read_Click(object sender, EventArgs e)
{
SoundPlayer player = new SoundPlayer(@"C:\record.wav");
player.PlayAsync();
}