Start up with Sub Main()

In VB6, I like to use my application start in Sub Main. I declare all forms in sub main and start my application with frmMain.Show. But in VB.NET I cannot do like this. After I run my application, it was opened and closed immediately. I don't understand why it was like that. Is it good to do this way, I mean declare all forms in module and start with MainForm.Show() in Sub Main()?

Well its probably not good to do it that way, at least not declaring everything in a module, its a bit wasteful. Only declare things as you need them. Although starting from a Sub Main is fine. You can either show the forms modally to fix your problem or run the main form via the application object:

VB Code:

'show modally
frm.ShowDialog()
 
'use application object
Application.Run(frm)
'or
Application.Run(New Form1)