how to display flash message to ask select a list from listbox

Question

can u guys check this code for me? i want to try display flash message if the user dont select any options from the listbox

Public Sub btnHVM_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnHVM.Click

        ListBoxHVM.Visible = True
        Code =ListBoxHVM.SelectedValue 

        If Code = "" Then

            Dim Message As String = "Please make a selection"
            MessageBox.Show(Message)

        End If    
If Code = "B" Then

            ChooseB1(Station)
            ChooseB2(Station)

        End If

        If Code = "A" Then
            ChooseA1(Station)
            ChooseA2(Site)
            ChooseA3()
        End If

End Sub

the listbox `ListBoxHVM` is only visible when you click `btnHVM` then how can u select item ?? — , Apr 24 '14 at 05:02
ehm in my form, i dont have to click on btnHVM to make ListBoxHVM visible. isnt that visible means that it visible all the time??? — zayya, Apr 24 '14 at 06:19

Bender · Answer 1 · 2014-04-24T02:38:56.140

0

You have to assign ListBoxHVM.SelectedValue to code

 Code=ListBoxHVM.SelectedValue

Edit 2

 If code = "" Then

edited Apr 24 '14 at 02:38

answered Apr 24 '14 at 02:28

Bender

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and the rest are okay?? – zayya Apr 24 '14 at 02:31
1

@lemon `ListBoxHVM.Visible = True` when `btnHVM_Click` event then how this will work ?? – Apr 24 '14 at 05:03
@LifeRunsOnCode Dammnn.. Forget that also -.- – Bender Apr 24 '14 at 05:06
@lemon if im not mistaken -1 means null or empty – zayya Apr 24 '14 at 06:06
@LifeRunsOnCode did u mean by, we need to click the button first?? – zayya Apr 24 '14 at 06:07
@zayya -1 never was null before . Null means no value '-1' is a value. null means '' (nothing) – Bender Apr 24 '14 at 06:09
@zayya based on the code you wrote you will always gonna get `"Please make a selection"` message – Bender Apr 24 '14 at 06:10
@zayya does your `ListBoxHVM` is visible and you can select item on your `ListBoxHVM` before you click `btnHVM` ? – Apr 24 '14 at 06:31
@LifeRunsOnCode yes, it is visible all the time – zayya Apr 24 '14 at 07:32
@zayya so why did you set `ListBoxHVM.Visible = True` on `btnHVM_click`and one more thing i want to know that have you selected any item in `ListBoxHVM ` before you click on `btnHVM ` – Apr 24 '14 at 08:09

how to display flash message to ask select a list from listbox

1 Answers1