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copied!<p>The situation you describe is pretty fishy. Whenever you close your program's startup form, the entire application should quit automatically, including closing <em>all other</em> open forms. Make sure that you're closing the correct form, and you should not experience any problems.</p> <p>The other possibility is that you've changed your project (using its Properties page) not to close until <em>all</em> open windows have been closed. In this mode, your application will not exit until the <em>last</em> remaining open form has been closed. If you've chosen this setting, you have to make sure that you call the <code>Close</code> method of <em>all</em> forms that you've shown during the course of application, not just the startup/main form.</p> <p>The first setting is the default for a reason, and if you've changed it, you probably want to go fix it back.<br> It is by far the most intuitive model for normal applications, and it prevents exactly the situation you describe. For it to work properly, make sure that you have specified your <em>main</em> form as the "Startup form" (rather than a splash screen or log-in form).</p> <p>The settings I'm talking about are highlighted here:</p> <p>   <img src="https://i.stack.imgur.com/ZFyew.png" alt="Visual Studio Project Properties"></p> <p>But primarily, note that <strong>you should never have to call <code>Application.Exit</code> in a properly-designed application</strong>. If you find yourself having to do this in order for your program to close completely, then you are doing something wrong. Doing it is not a bad practice in itself, as long as you have a good reason. The other two answers fail to explain that, and thus I feel are incomplete at best.</p>

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