New to .NET - Why does my application quit when I exit Sub Main?Migration - Form Loading Differences in .NET |   | I am new to VB.NET, coming from VB6. Why does my application quit after loading a form from Sub Main?
Form loading is different in VB6 and .NET, whether VB.NET or C#. In NET, forms are not loaded directly as they were in VB6. Rather, you must create an instance of the form and then use the Show method of the form object. Many people, new to .NET, do the following in Sub Main, which worked in VB6, but not in VB.NET.
Module Module1
Public Sub Main()
Dim frm As New Form1
frm.Show()
End Sub
End Module
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In this case, an instance of Form1 will flash on the screen and the application will quit as soon as the Form_Load method is completed (even faster if there is no Form_Load event). What's the problem?
The problem is that "frm" is a local instance of an object, that is disposed as soon as Sub Main is exited. There are two ways to solve this problem. The first is shown below:
Module Module1
Public Sub Main()
Dim frm As New Form1
frm.ShowDialog()
End Sub
End Module
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However, the preferred method is shown next.
Module Module1
Public Sub Main()
Dim frm As New Form1
Application.Run(frm)
End Sub
End Module
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