Use the Module in VB NET
Is sometimes useful to have functions or variables available everywhere in a Visual Basic project. You could use a module to do so. It is not complicate. There is no class creation. And you could easily use this technique in VBA or VB6 (Visual Basic Application, Visual Basic Enterprise VB6, �) Module could also be used to share information or objects between classes.
Start creating a project. I choose the Windows Forms Project. Here is a sample of form1.
''' <summary> ''' put a Timer without the Visual Basic form Designer ''' </summary> ''' <remarks></remarks> Public Class Form1 Private WithEvents oTimer As System.Windows.Forms.Timer Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load oTimer = New System.Windows.Forms.Timer oTimer.Interval = 1000 oTimer.Enabled = True oTimer.Start() If oTimer Is Nothing Then MsgBox("oTimer is Nothing") End If Dim oForm2 As New Form2 oForm2.Show() End Sub Private Sub timerTicks() Handles oTimer.Tick Me.Text = Date.Now Module1.sTime = Date.Now End Sub End Class |
Create a form2 :
Public Class Form2 Private Sub Form2_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load End Sub Private Sub updateme() Handles Me.MouseDown Me.Text = Module1.sTime Me.Refresh() End Sub End Class |
Now create Module.vb.
Module Module1 Public sTime As String End Module |
Here is how my solution explorer looks like this.
Alright, my code is really stupid, I know! But I only wanted to show you something very interesting.
On form1, there is a timer running over and over. Every second, it displays the time. In fact, is nothing more than a simple clock. But the clock saves the time in Module1.sTime
Now, imagine I have another called form2. That second form would like get the timer value but it can�t directly. There is no methods to give the information, the variable is private, no heritage, NOTHING!!!!
Is time to use the Module. The advantage is that Modules are �available everywhere� at any time the module variables, properties, methods are also accessible as long there are public. That is all. Just keep that in mind.
So run your code, when your hold down your mouse button over the form2, it reads the value inside Module1. You could pass any object from one class to another simply by using a module.
By the way, feel free to change your code and make it suitable for you:
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load Dim oForm2 As Form2 Try 'alway try to put code that might crash in a try-catch oTimer = New System.Windows.Forms.Timer With oTimer .Interval = 1000 .Enabled = True .Start() End With If oTimer Is Nothing Then MsgBox("oTimer is Nothing") oForm2 = New Form2 oForm2.Show() Catch ex As Exception MsgBox("ERRRRRROR !!!! " & vbCrLf & ex.Message) 'idiot! you made a error End Try End Sub |
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