listview - count checked items

Hope someone can help..........

Code:

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    Private Sub CheckBox1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged
        If CheckBox1.Checked = True Then
            For Each CheckedApp As ListViewItem In App_List.Items
                CheckedApp.Checked = True
                Button1.Text = "Start installing (" + App_List.Items.Count > -1 + " apps.)"
            Next
        ElseIf CheckBox1.Checked = False Then
            For Each CheckedItem As ListViewItem In App_List.Items
                CheckedItem.Checked = False
            Next
        End If
    End Sub

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problem, checkbox1 isn't checking items and the button text, i not sure works....

Your question (and I use the term loosely) doesn't really make sense. The title mentions counting checked items but your code doesn't seem to have anything to do with counting. I'm guessing that English is not your first language but please try to provide a FULL and CLEAR explanation of what you're actually trying to achieve instead of expecting us to work it out from code that doesn't actually work.

I don't understand the question either...

Code:

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Button1.Text = "Start installing (" + App_List.Items.Count > -1 + " apps.)"

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Shouldn't that be

Code:

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Button1.Text = "Start installing (" + (App_List.Items.Count - 1).ToString() + " apps.)"

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?

Other than that, I can't really guess what's wrong.

formlesstree4 is right, but also you're resetting Button1.Text for every item in your loop. in vb2012:

Code:

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Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
    Array.ForEach(App_List.Items.Cast(Of ListViewItem).ToArray, Sub(lvi) lvi.Checked = CheckBox1.Checked)
    Button1.Text = If(CheckBox1.Checked, "Start installing (" + (App_List.Items.Count > -1).ToString + " apps.)", "some other string")
End Sub

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Checkbox1 should check allitems in listtview but is not...

and am not sure if the button text that counts, works..

try my code from post #5
I tested it + I know it works, as does your original code with formlesstree4's modification

I got error: Error 1 'Cast' is not a member of 'System.Windows.Forms.ListView.ListViewItemCollection'. H:\X17-59183\PostInstall\PostInstall\SelectPrograms.vb 40 23 PostInstall

plus what exactly does the code do?

It checks or unchecks all items + sets the button text.

Which version of vb are you using + which framework are you targetting?