asked on

Loop through Controls in .NET

You would think this would be the easiest task to do in VB .Net, but the old way of doinf thinsg does not seem to work
And do you reckon I can find it anywhere on the Microsoft Site?

Can someone tell me how I loop through all Textboxes on a Form to simply empty them.
The textboxes are inside a TabPage

Wayne

bacon7181

I just recently had to loop through all the controls on a form for something.

This is just one way that you could implement this loop, this uses a recursive function.

Public Sub DoTheLoop()
LoopThroughAllControls(Me.Controls)
End Sub

Private Sub LoopThroughAllControls(ByVal controls As ControlCollection)
Dim c As Control
For Each c In controls
If GetType(TextBoxBase).IsInstanceOfType(c) Then
' c is a textbox based control, do something with it
End If
' loop through sub controls
LoopThroughAllControls(c.Controls)
Next
End Sub

wlawson

ASKER

Thanks for that it works well for all Controls on the actual form, but it will not work for anything within the TabPage Control.

Wayne

wlawson

ASKER

I can see what your code is trying to do and if feed the TabControl into your Sub Rountine I can count the Controls on the page, but when I try to loop through the controls I get an error "Specific Cast is not valid"

ASKER CERTIFIED SOLUTION

bacon7181

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wlawson

ASKER

Top Shelf ... Worked a treat