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    <p>Your <code>Speak</code> method could return the process it's started:</p> <pre><code>public Process Speak() { // Code as before return process1; } </code></pre> <p>Then you can write:</p> <pre><code>private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { TextToSpeech obj = new TextToSpeech(); Process process = obj.Speak(); process.Kill(); } </code></pre> <p>If you want to actually start the process in one event and kill it in another, you'll probably want an instance variable in your form which maintains the last-started process:</p> <pre><code>private Process speechProcess; private void StartButtonClicked(object sender, EventArgs e) { // TODO: consider what you want to happen if there's already // a process running TextToSpeech obj = new TextToSpeech(); speechProcess = obj.Speak(); } private void StopButtonClicked(object sender, EventArgs e) { // Possibly change the UI so that the button will be disabled // when there's no process running if (speechProcess == null) { return; } speechProcess.Kill(); speechProcess = null; } </code></pre> <p>EDIT: As noted in comments, this ties the <code>TextToSpeech</code> class to the idea of using a process. It would be provide better encapsulation if you made <code>TextToSpeech</code> responsible for the process management, so you could ask that to start and stop appropriately. Then you'd change the <code>speechProcess</code> variable above from a <code>Process</code> type variable to <code>TextToSpeech</code>.</p>
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    1. POhow to execute a method specific to a function in a different class from the main form class? (c#)
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    1. USJon Skeet
    1. USJon Skeet
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    1. COthanks Jon. Let me try.
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      1. USnawfal
    2. COI think that the Process instance should be an private implementation detail of the `TextToSpeech` class. There could be implementations that don't use any external processes at all. I'd suggest makeing the TextToSpeech-instance itself an instance variable of the form and implement a "StopSpeak" method (see my response below)
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      1. USMartinStettner
    3. CO@MartinStettner: That's a good alternative approach, yes.
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