[RESOLVED] IsPostBack Running Twice

Hi there I am using
if not IsPostBack then
to check if a list box is loaded for the first time
this worked fine when the page was the main form

Protected Sub frmloc_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles frmloc.Load
Dim locations As New tbllocAdapter
Dim allStock As New tbl_StockTableAdapter
If Not IsPostBack Then
sltLoc.DataSource = locations.faetlocdata
sltLoc.DataValueField = "Location"
sltLoc.DataTextField = "Location"
sltLoc.DataBind()
Else
oblstRec.DataSource = allStock.getstock(sltLoc.Selection.Value)
oblstRec.DataBind()
End If
End Sub

but now i have a main screen that selects this form from a drop down list(search criteria)
by dowing this it now trys to run the else statment when the page is first loaded which of course from the code is trying to load an object list that has been created yet as the list is poulated when an option from the dropdown is selected.

Like I said this worked whne the page was the main form but now it is not it seems to ignore the not IsPostBack and go to the else straigth away
anyone have any ideas
lee

You could use querystring to flag your child form from your main form. FYI this belongs in the asp.net forum.

did you set a break point on your form load and step through while you are running it to see whats going on?

Hi there
yes tried running a break point, was hard to do pages took ages to load, not sure why though it would run as normal, what happen was that the IfPostBack is populating the dropdownlist as it should but it is then also running the else part of the stament as well which of course wont run unless it is a postback.
any ideas
lee

it seams to be running all the code in the loadevent and ignoring the if statment arround the code, that how it appears anyway when I run through it, this only happen when I added another form that activates that form by me.activeform = frmsel, if i run the form direct as the first form to load it works

I found what is happening but no idea why the load event for frmsel is loadinf first when form frmmain is loaded and then again when form frmsel is loaded thats why it thinks it is a postback when frmsel loads, anyone know why the load event for frmsel would load when frmmain runs, I do not have a load event at all for the frmmain so i am not calling it by accident
any ideas
lee

I have worked out what is wron, the form frmsel's load event is running when the page first loads, and not just whne the form loads, have no idea why though anyone have any ideas
lee

If the page is loading from some postback event raised by a control on the page then the .IsPostback will = True.

Moved.

this is my full code, for some reason the frmloc load event is loading when the page loads and again when the form loads the first form to load is frmmain which does not run anything on load, but the frmloc load function still runs.
see what u think

VB Code:

Imports stockdataTableAdapters
Imports System.Drawing
Partial Class _Default
    Inherits System.Web.UI.MobileControls.MobilePage
 
    Protected Sub frmloc_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles frmloc.Load
        Dim locations As New tbllocAdapter
        Dim allStock As New tbl_StockTableAdapter
        If Not IsPostBack Then
            sltLoc.DataSource = locations.faetlocdata
            sltLoc.DataValueField = "Location"
            sltLoc.DataTextField = "Location"
            sltLoc.DataBind()
        Else
            oblstRec.DataSource = allStock.getstock(sltLoc.Selection.Value)
            oblstRec.DataBind()
        End If
    End Sub
 
 
    Protected Sub oblstRec_ItemSelect(ByVal sender As Object, ByVal e As System.Web.UI.MobileControls.ObjectListSelectEventArgs) Handles oblstRec.ItemSelect
        Me.ActiveForm = Me.FrmUpd
        lblpn.Text = e.ListItem.Item("PartNumber")
        lblpna.Text = e.ListItem.Item("PartName")
        lblc.Text = e.ListItem.Item("Condition")
        lbll.Text = e.ListItem.Item("Location")
        lblq.Text = e.ListItem.Item("Quantity")
        lblv.Text = e.ListItem.Item("Valid")
 
        If (lblv.Text = 0) Then
            lblv.ForeColor = Color.Red
            lblv.Text = "FALSE"
        Else
            lblv.ForeColor = Color.Green
            lblv.Text = "TRUE"
        End If
 
    End Sub
 
    Protected Sub cmdfind_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdfind.Click
        Dim allStock As New tbl_StockTableAdapter
        oblstRec.DataSource = allStock.getstock(sltLoc.Selection.Value)
        oblstRec.DataBind()
 
    End Sub
 
    Protected Sub cmdupdate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdupdate.Click
        Dim allStock As New tbl_StockTableAdapter
        allStock.Updaterecord(txtpartn.Text, txtcon.Text, txtloc.Text, txtquan.Text, txtval.Text, lblpartn.Text)
        Me.ActiveForm = Me.frmloc
    End Sub
 
    Protected Sub cmdcanc_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdcanc.Click
        Me.ActiveForm = Me.FrmUpd
    End Sub
 
 
    Protected Sub cmdedit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdedit.Click
        Me.ActiveForm = Me.frmRes
        lblpartn.Text = lblpn.Text
        txtpartn.Text = lblpna.Text
        txtcon.Text = lblc.Text
        txtloc.Text = lbll.Text
        txtquan.Text = lblq.Text
        txtval.Text = lblv.Text
        If (txtval.Text = "FALSE") Then
            txtval.Text = 0
        Else
            txtval.Text = 1
        End If
 
    End Sub
 
    Protected Sub cmdlback_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdlback.Click
        Me.ActiveForm = Me.frmloc
    End Sub
 
    Protected Sub cmdmssel_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdmssel.Click
        If (sltmsel.Selection.Value = "Location") Then
            Me.ActiveForm = Me.frmloc
        ElseIf (sltmsel.Selection.Value = "Name") Then
            Me.ActiveForm = Me.frmloc
        ElseIf (sltmsel.Selection.Value = "Number") Then
            Me.ActiveForm = Me.frmloc
        End If
    End Sub
 
End Class

I do call the formloc from a selection in a dropdown list on frmmain, if this does mean that postback will then be set to true how do i get the dropdown list on frmloc to only load once
hope i am making sence im new to this
lee

I have change the load event to a form activate event and it does not run twice anymore, but when the frmloc activate event load postback is true when it should be false as the form has just loaded. I know as i actvated the form from a cmdbutton on another page that postback is the set to true but i need it to be false the first time the form loads as to only poulate the dropdown list once the display the data everyother time.
any ideas
lee

Yes, if it is being called from the dropdown on frmmain then it will generate a postback.

Maybe check that the listbox contains any items instead?

Threads merged.

Hi there thanks for the reply you are right thats what i need to do, do you know how i can check if a dropdown list holds any data or not not sure on that one
lee

Should be an ddl.Items.Count property to check for > 0

Thats it it work, thanks ever so much there is no way I coulkd have worked that out my self that brilliant
thanks allot
lee

Glad its working now. :)

Ps, dont forget to Resolve your thread. ;)

how do i resovle the thread
never done that im new

found it thanks again for all your help
lee

use the thread tools menu above (my signature has a screen shot of it)