webbrowser control

Am just starting to use a web browser control.

I've added some handlers like so

VB Code:

Private Sub AxWebBrowser1_DocumentComplete(ByVal sender As Object, ByVal e As AxSHDocVw.DWebBrowserEvents2_DocumentCompleteEvent) Handles AxWebBrowser1.DocumentComplete
        Dim doc As mshtml.HTMLDocument
        doc = CType(AxWebBrowser1.Document, mshtml.HTMLDocument)
        Dim iEvent As mshtml.HTMLDocumentEvents2_Event
        iEvent = CType(doc, mshtml.HTMLDocumentEvents2_Event)
        AddHandler iEvent.onclick, AddressOf ClickEventHandler
        AddHandler iEvent.onmouseover, AddressOf MouseOverEventHandler
        AddHandler iEvent.onmouseout, AddressOf MouseoutEventHandler
       
    End Sub

These fire the following fine

VB Code:

Private Sub MouseoutEventHandler(ByVal e As mshtml.IHTMLEventObj)
        Me.Timer2.Enabled = True
    End Sub
 
    Private Sub entform()
 
        If Me.Opacity < 1.0 Then
            Me.Opacity = 1.0
        End If
   
 
        Me.Timer2.Enabled = False
        
    End Sub
    Private Sub MouseOverEventHandler(ByVal e As mshtml.IHTMLEventObj)
        entform()
    End Sub
 
  Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
        If Me.Opacity > 0.2 Then
            Me.Opacity = Me.Opacity - 0.01
        Else
            Me.Timer2.Enabled = False
            
        End If
 
 
 
    End Sub

But after about 2minutes the MouseOverEventHandler stops working. Why would this be, and how do I stop this happening.

MouseOverEventHandler calls entform which clearly stops the timer. Your code stops it.

Just because the mouse goes over something, don't expect that it will ever leave it. You can Alt-Tab away from the program, move the mouse, and then Alt-Tab back. In this case, the mouse out will never fire.

No I'm testing this program so the mouse is leaving and entering the form. When the mouse leaves the form it slowly becomes transparent, each time the timer fires it becomes that little bit more transparent.
When the mouse renters the form it becomes solid again.

This all works fine for the first minute or so, but at some point the MouseOverEventHandler stops firing, even though I am moving the mouse over the form. This only seems to be an issue with the mouse over of the web control, as it works fine for other controls.