VB.NET: Trigger Event inside Listbox....[Resolved]

[toytoy]

Does anyone know how to trigger the event inside the listbox when i double click on it....

Say when i double click on one of the items, it will bring me to another form...

Thanks

[Lil Ms Squirrel]

Try adding code to the DoubleClick event?

And use the listbox's selected item property to retrieve the value to pass to the form you want to open.

Expand on the problem a little more if you want more advice

[toytoy]

can post some examples on doing it....

I am confuse...

Thanks

[Lil Ms Squirrel]

Before I do, are the items in your listbox just strings?

[Lil Ms Squirrel]

Okay, this example assumes you have a list box containing five customers. It also assumes you have a customer form with a public variable called CustomerID.

Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
        Dim customerForm As New frmCustomer
        Select Case ListBox1.SelectedItem.ToString
            Case "Customer 1"
                customerForm.CustomerID = 1
            Case "Customer 2"
                customerForm.CustomerID = 2
            Case "Customer 3"
                customerForm.CustomerID = 3
            Case "Customer 4"
                customerForm.CustomerID = 4
            Case "Customer 5"
                customerForm.CustomerID = 5
        End Select
        customerForm.Show()
    End Sub

[toytoy]

Lil Ms Squirrel thanks...it works..

how about if the items is Integer.....how to do it ?..

now i have another problem..

say double click on one of the items in the listbox from Form1, it will bring me to Form2..

but from Form2, how to link back to form1 again...

This is my coding..

  'Inside Form1 

   Public vForm2 As New Form2
   Public vForm3 As New Form3

    Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick

        Dim form2 As New Form2
        Dim form3 As New Form3
        Select Case ListBox1.SelectedItem.ToString
            Case "Form2"
                form2.Show()
                vForm2.Owner = Me
                Me.Hide()
            Case "Form3"
                form3.Show()
                vForm3.Owner = Me
                Me.Hide()
        End Select
 End Sub

'Inside Form2  
Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label2.Click
        Me.Owner.Show()
    End Sub

'Inside Form3  
    Private Sub Label3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label3.Click
        Me.Owner.Show()
    End Sub

The above code cannot works....it give an error:

Additional information: Object reference not set to an instance of an object.

Thanks

[Lil Ms Squirrel]

You've gotten your variables a bit mixed up.

Either:

'Inside Form1 
 
   Public vForm2 As New Form2
   Public vForm3 As New Form3
 
    Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
 
       Select Case ListBox1.SelectedItem.ToString
            Case "Form2"
                vForm2.Show()
                vForm2.Owner = Me
                Me.Hide()
            Case "Form3"
                vForm3.Show()
                vForm3.Owner = Me
                Me.Hide()
        End Select
 End Sub

Or

'Inside Form1 
 
    Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
 
        Dim form2 As New Form2
        Dim form3 As New Form3
        Select Case ListBox1.SelectedItem.ToString
            Case "Form2"
                form2.Show()
                form2 .Owner = Me
                Me.Hide()
            Case "Form3"
                form3.Show()
                form3 .Owner = Me
                Me.Hide()
        End Select
 End Sub

You were using a mixture of the two, hence when you asked form2 what it's Owner was, you were referring to a different object than the one you'd set the property for.

Hope this helps

[toytoy]

thanks....

but both your methods cannot work..

it still give the same error..

[Lil Ms Squirrel]

I hate to sound pedantic but have you copied and pasted the code into your project? They both work in the project I have here so maybe we are at cross purposes somewhere :

Post back what you NOW have in your form and I'll take another look

[toytoy]

ooh.....it is my error..

it works...

I left out some coding after i double check it...


thanks