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Q: Closing the form When I run my program, I need to close the form after two hours, in the timer event, I use: var form = Application.OpenForms[0] as frmOperacao; form.Close(); But, my problem is that, when I run my program the first time, I receive the error, in the timer event: Object reference not set to an instance of an object. My error is in this line: var form = Application.OpenForms[0] as frmOperacao; I'm using.NET 4.0 A: As a suggestion, you should not use Application.OpenForms. This collection is an enumeration of the forms in the current application. It represents a snapshot of the collection at a particular time; you can't add forms to this collection or remove them from it. It is not necessarily a snapshot of the current state of the application. The snapshot is taken before any code in the application has a chance to modify the forms collection. It is better to use Application.OpenForms directly. If there are no forms open, then OpenForms will be null. This code is better: private void timer1_Tick(object sender, EventArgs e) { if (Application.OpenForms.Count == 0) Application.Exit(); var form = Application.OpenForms[0] as frmOperacao; form.Close(); } Q: Expression for months in which.NET Framework shipped with a version I'm looking for a way to define months in which.NET Framework shipped with a version. Something like this: 1.0 2.0 3.5 4.5 So far, I've defined periods that did the trick for me (1.0, 2.0 and 3.5), but this seems to be quite limited, since I had to manually check the version number in this definition. Any ideas? A: You can do that by checking the assembly version numbers. For example: [assembly: AssemblyVersion("1.0.*")] [assembly: AssemblyVersion("2.0 be359ba680


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