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Visual Basic 2005 Basics If you are new to Visual Basic programming with version 2005, this is the place to start your questions. For questions about the book: Beginning Visual Basic 2005 by Thearon Willis and Bryan Newsome, ISBN: 0-7645-7401-9 please, use this forum instead.
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Old September 25th, 2010, 10:55 PM
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Red face Uncheck chkboxes

i have a groupbox with 18 checkboxes. I want to unchcek all checked boxes with Reset button click. can some on help me
i am using visual studio 2005. Thanks in advance

Here is more information

Dim ctrl As Control
Dim chkb As CheckBox
ForEach ctrl InMe.Controls
If (ctrl.GetType() IsGetType(CheckBox)) Then
chkb = CType(ctrl, CheckBox)
chkb.Checked = False
EndIf
'MessageBox.Show(ctrl.ToString)
-----Comment---- The purpoe of Line above is to see whichcontrols this code is finding on the form.
Next

This code works when I put all checkboxes on the form but when i put the checkboxes inside a groupbox then it doesnt do nothing. The messagebox.show(ctrl.tostring) tells me it does find the groupbox but doesnt see inside of the groupbox. When helping with the code please do explain me this behavior also.
Thanks a bunch in advance and i mean it
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Last edited by Yasho; September 26th, 2010 at 12:33 AM. Reason: adding more information
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Old September 26th, 2010, 12:14 PM
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If you read your code, your not handling any groupbox's all your checking for are checkboxes, and to see inside something else control array you need to specify that control array.

Its a simple fix, I would seperate out all the code.

Code:
 Private Sub Searcher(ByVal cntrl As Control)
        Dim n As ControlCollection = cntrl.Controls

        For Each ctrl As Control In n
            If ctrl.GetType = GetType(CheckBox) Then 'see if the ctrl is a checkbox
'The thing about this bit here, is if you tag all the chkboxes with a letter then
'you can check all these tags to make proper sure its the ones you want
'to disable. or you can find some other method, if you set this sub routine
'to start on the Form (i.e. Me) then it will recursively search all the controls on the form until it all done
                Dim chk As CheckBox = CType(ctrl, CheckBox) 'convert the ctrl to checkbox
                If Not chk.CheckState = CheckState.Unchecked Then 'this works for even three state checkboxes
                    chk.Checked = False
                End If
            Else
                Try
                    Searcher(ctrl) 'if the ctrl has a control array then search if it throws back an error skip over it
                Catch ex As Exception
                    Exit Sub
                End Try
            End If
        Next
    End Sub
You can take this a skeleton code and customise it to the ends of the earth to get it to check and so on forth and you can have do what ever in terms of searching, its pretty versatile!
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