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VS 2008 VB.NET :: Sub Main()
Posted on 2008-10-01
Dear Experts,
If I would like to execute some code on a form's creation or on create event I have read I need to use the Sub Main() procedure.
I have build a demo app and in Sub Main() I did the typical "Hello Word" messagebox but it do not display when running the application.
What am I doing wrong?
Please see code:
If I would like to execute some code on a form's creation or on create event I have read I need to use the Sub Main() procedure.
I have build a demo app and in Sub Main() I did the typical "Hello Word" messagebox but it do not display when running the application.
What am I doing wrong?
Please see code:
Public Class frmMain
Shared Sub Main()
MessageBox.Show("Hi")
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGenerateLabels.Click
Dim frmGenerate As New frmGenerateLabels
frmGenerate.Show()
End Sub
End Class
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7 Comments
First, you need a new module file:
Module Startup
Public Sub Main()
Dim myForm As New Form1
MsgBox("hello world")
Windows.Forms.Application.
End Sub
End Module
Then you have to disable the App framework in your projects properties to be able to start the project from sub main. Once Main() takes charge, you can start the app framework, modify forms, whatever...
Module Startup
Public Sub Main()
Dim myForm As New Form1
MsgBox("hello world")
Windows.Forms.Application.
End Sub
End Module
Then you have to disable the App framework in your projects properties to be able to start the project from sub main. Once Main() takes charge, you can start the app framework, modify forms, whatever...
Here is how your properties should look:
screenshot.PNG
screenshot.PNG
The author said:
"If I would like to execute some code on a form's creation or on create event I have read I need to use the Sub Main() procedure."
If you are dealing with a FORM, then you want to add code to the CONSTRUCTOR of your Form...also known as the "New" event:
Public Class frmMain
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
' ...your code in here...
End Sub
End Class
If you want to do something when a Form is DISPLAYED (rather than created) then use either the Load() or Shown() events.
If you want to run something at the beginning of your APPLICATION (before any forms are displayed) then use the Application.Startup() event:
http://msdn.microsoft.com/en-us/library/w3xx6ewx.aspx
http://msdn.microsoft.com/en-us/library/t4zch4d2.aspx
"If I would like to execute some code on a form's creation or on create event I have read I need to use the Sub Main() procedure."
If you are dealing with a FORM, then you want to add code to the CONSTRUCTOR of your Form...also known as the "New" event:
Public Class frmMain
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
' ...your code in here...
End Sub
End Class
If you want to do something when a Form is DISPLAYED (rather than created) then use either the Load() or Shown() events.
If you want to run something at the beginning of your APPLICATION (before any forms are displayed) then use the Application.Startup() event:
http://msdn.microsoft.com/en-us/library/w3xx6ewx.aspx
http://msdn.microsoft.com/en-us/library/t4zch4d2.aspx
If I would like to execute some code on a form's creation or on create event I have read I need to use the Sub Main() procedure.I thought what he was getting at was how to execute code prior to form creation. Like Idle said, if you need to catch the forms constructor directly then, New() is the bunny.
If you are dealing with a FORM, then you want to add code to the CONSTRUCTOR of your Form...also known as the "New" event:
Also, I see ALOT of people using Sub Main when they really shouldn't be...
I suspect that they have found examples for VB.Net 2003 (or below) when the Application.Startup() event and the Application Model didn't even exist yet. Many other languages use the concept of "Main" as well...Microsoft didn't do anyone any favors by BURYING access to the Application Events via a button in the very bottom right (not visible by default on my monitor!...have to scroll to find it!) of the Project --> Properties section on a specific Tab.
=\
I suspect that they have found examples for VB.Net 2003 (or below) when the Application.Startup() event and the Application Model didn't even exist yet. Many other languages use the concept of "Main" as well...Microsoft didn't do anyone any favors by BURYING access to the Application Events via a button in the very bottom right (not visible by default on my monitor!...have to scroll to find it!) of the Project --> Properties section on a specific Tab.
=\
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