The using function in VB.NET
In VBA or some other programming language, you offend need to make sure you declare, create and clear an object.
Check this VBA sample (totally fake I know):
Public Sub vbatest() Dim oDocument As Document Set oDocument = New Document 'do something here Set oDocument = Nothing End Sub |
But what if you want to do thing like the old fashion way. What if you want to tell exactly with to set an object to nothing?
Using Visual Studio 2010, I�ll show you 2 code samples. The first one is the simple way. The second one uses the using function.
''' <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 End Sub Private Sub timerTicks() Handles oTimer.Tick Me.Text = Date.Now End Sub End Class |
''' <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 Using oTimer = New System.Windows.Forms.Timer oTimer.Interval = 1000 oTimer.Enabled = True oTimer.Start() End Using If oTimer Is Nothing Then MsgBox("oTimer is Nothing") End If End Sub Private Sub timerTicks() Handles oTimer.Tick Me.Text = Date.Now End Sub End Class |
The using function makes sure your object you use is set to nothing after it leaves the End Using.
I don�t have any practical situation where you could use or not the Using function.
Please note that an Object is not necessary deleted when the function ends. In fact, never assume your object is set to nothing automatically.
The program I love to use:
The program I love to use:
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