CODEWITHSUNDEEP
vb.netcomboboxcompact-framework
KarMag
KarMag

Reputation: 122

How to catch value in a ComboBox just before SelectedValueChanged

I work on VB.net Compact-framework (VS2008), I use a ComboBox, and I wish to have a function that get the previous SelectedValue, just before the SelectedValue changes to the new one (actually changes the DisplayMember).

Here is a generic example:

Private Sub ComboBox1_SelectedValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedValueChanged
    Dim Bool As Boolean
    Bool = MyFunctionClose(ComboBox1.SelectedValueBeforeChange)
    ...
    Bool = MyFunctionOpen(ComboBox1.SelectedValue)
    ...
End Sub

My question is: Is it possible to catch such ComboBox1.SelectedValueBeforeChange?

Upvotes: 1

Views: 666

Answers (1)

Keith Mifsud
Keith Mifsud

Reputation: 725

just store the SelectedValue in a variable on the event:

    Private cb1PrevValue as object = nothing

    Private Sub ComboBox1_SelectedValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedValueChanged
        Dim Bool As Boolean
        If cb1PrevValue Is Nothing Then
            'cb1PrevValue = DEFAULT_VALUE (Give it a default value for when it is selected the first time)
        End If
        Bool = MyFunctionClose(cb1PrevValue)
        cb1PrevValue = ComboBox1.SelectedValue
        ...
        Bool = MyFunctionOpen(ComboBox1.SelectedValue)
        ...
    End Sub

Upvotes: 1

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