[RESOLVED] using fields from Form1 no longer works ?

[lol707]

I have a multi-form Windows Mobile 6 app where the initial form (Startup object ) is called Form1.

On Form1 I complete a few combo boxes - user Name - Sales area - Date etc

From there I use Radio buttons to load other forms ... and it all worked fine

BUT ....

I decided to put a pretty new form on the front - use that as the Startup object - and from that load Form1 - and then process as before.

The other forms can no longer pick up the fields from Form1 !!!

I use a simple format on (say) Form2 ........

me.tbUsername.text = Form1.cbUsername.text

and it worked fine - but now doesn't !!

Unless I reset Form1 as my Startup object .. and then it is a happy bunny again ??

Is this a known problem please ?

PS I tried changing the code to use a return call ..

Public Function showDistrict() As String

        Return Me.cbDistrict.Text

    End Function

with an appropriate ...

Me.tbDistrict.Text = Form1.showDistrict()

on form2

it did not help ?

[dminder]

On my mobile apps, I use a module to keep track of data between forms. Just makes it easier to update plus it will stay there as long as the program runs. Maybe you could try the same?

HTH,

D

[stanav]

Stop using default form instances....
When you do this in Form2

me.tbUsername.text = Form1.cbUsername.text

A default instance of Form1 is created, and that instance is not the same instance of Form1 that you already have, thus you don't get the data expected.

[lol707]

Thanks for that Stanav ....

That makes sense .... so how should I have done it please ?

(I wonder why it worked previously ?)

[stanav]

You need to somehow pass a reference of the instance of Form1 you have to the other form. This can be done by creating a property in the other form and set it when you create a new instance. something like this

'This is in form1, when you are about to show form2
Dim frm2 As New Form2()
frm2.FormRef = Me '<<< You're passing a reference of this Form1 instance to Form2 here
frm2.Show()

====================================================

'Then in Form2, you declare a property called FormRef
Private _FormRef As Form1 = Nothing
Public Property FormRef() As Form1
    Get
         Return _FormRef
    End Get
    Set (ByVal value As Form1)
        _FormRef = value
    End Set
End Property


'And then when you want to get some value from Form1, you do
Dim frm1 As Form1 = Me.FormRef
If frm1 IsNot Nothing Then
     Me.tbDistrict.Text = frm1.showDistrict()
End If

[lol707]

Many thanks for that Stanav -

I will try that now and let you know how I get on ..

Your patience is very much appreciated

[lol707]

The great news is that it workd perfectly - so many thanks for that ..

The quite good news is that I actually understand about half of it ... so can spend some quality time learning the rest :-)