Why is this event firing?

[rodchar]

Hey all,
I've the following code:

Dim _postBack As Boolean = False
Dim _ds As New DataSet1
Dim _dt As DataSet1.CustomersDataTable
Dim _dr As DataSet1.CustomersRow

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
SqlDataAdapter1.Fill(_ds)
_dt = _ds.Customers
ListBox1.DataSource = _dt
ListBox1.DisplayMember = "ContactName"
ListBox1.ValueMember = "CustomerID"
_postBack = True
End Sub

Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object, ByVal
e As System.EventArgs) Handles ListBox1.SelectedValueChanged
If _postBack = True Then
MessageBox.Show("Finding customer...")
_dr = _dt.FindByCustomerID(ListBox1.SelectedValue)
TextBox1.Text = _dr.ContactName
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
_dr.ContactName = TextBox1.Text
MessageBox.Show(_dr.RowState.ToString)
End Sub

Why?, when I click the Button1, does the ListBox1_SelectedValueChanged run?

To recreate:
All you need is Northwind.
I used the SqlDataAdapter wizard
Generated a typedDataset(no instance)

[Imran Koradia]

Since the listbox is databound, the index will change on filling the
dataset.
http://groups.google.com/groups?th=fa80dc67a61f9228
(look for a workaround in the posts above)

Imran.

"rodchar" <ro*****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com...

Hey all,
I've the following code:

Dim _postBack As Boolean = False
Dim _ds As New DataSet1
Dim _dt As DataSet1.CustomersDataTable
Dim _dr As DataSet1.CustomersRow

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
SqlDataAdapter1.Fill(_ds)
_dt = _ds.Customers
ListBox1.DataSource = _dt
ListBox1.DisplayMember = "ContactName"
ListBox1.ValueMember = "CustomerID"
_postBack = True
End Sub

Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedValueChanged
If _postBack = True Then
MessageBox.Show("Finding customer...")
_dr = _dt.FindByCustomerID(ListBox1.SelectedValue)
TextBox1.Text = _dr.ContactName
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
_dr.ContactName = TextBox1.Text
MessageBox.Show(_dr.RowState.ToString)
End Sub

Why?, when I click the Button1, does the ListBox1_SelectedValueChanged run?
To recreate:
All you need is Northwind.
I used the SqlDataAdapter wizard
Generated a typedDataset(no instance)

[rodchar]

Do you know how I can utilize my _postBack flag to make this work?

"Imran Koradia" wrote:

Since the listbox is databound, the index will change on filling the
dataset.
http://groups.google.com/groups?th=fa80dc67a61f9228
(look for a workaround in the posts above)

Imran.

"rodchar" <ro*****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com...

Hey all,
I've the following code:

Dim _postBack As Boolean = False
Dim _ds As New DataSet1
Dim _dt As DataSet1.CustomersDataTable
Dim _dr As DataSet1.CustomersRow

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
SqlDataAdapter1.Fill(_ds)
_dt = _ds.Customers
ListBox1.DataSource = _dt
ListBox1.DisplayMember = "ContactName"
ListBox1.ValueMember = "CustomerID"
_postBack = True
End Sub

Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object,

ByVal

e As System.EventArgs) Handles ListBox1.SelectedValueChanged
If _postBack = True Then
MessageBox.Show("Finding customer...")
_dr = _dt.FindByCustomerID(ListBox1.SelectedValue)
TextBox1.Text = _dr.ContactName
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
_dr.ContactName = TextBox1.Text
MessageBox.Show(_dr.RowState.ToString)
End Sub

Why?, when I click the Button1, does the ListBox1_SelectedValueChanged

run?

To recreate:
All you need is Northwind.
I used the SqlDataAdapter wizard
Generated a typedDataset(no instance)

[Imran Koradia]

Is this an ASP.NET project? I'm not sure what the _postBack flag does. Is
this a variable you've created? If you are using the variable for something
else then I would suggest you create a new variable as mentioned in the link
I sent. Any reason why you cant do it that way?

Imran.

"rodchar" <ro*****@discussions.microsoft.com> wrote in message
news:D1**********************************@microsof t.com...

Do you know how I can utilize my _postBack flag to make this work?

"Imran Koradia" wrote:

Since the listbox is databound, the index will change on filling the
dataset.
http://groups.google.com/groups?th=fa80dc67a61f9228
(look for a workaround in the posts above)

Imran.

"rodchar" <ro*****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com...

Hey all,
I've the following code:

Dim _postBack As Boolean = False
Dim _ds As New DataSet1
Dim _dt As DataSet1.CustomersDataTable
Dim _dr As DataSet1.CustomersRow

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
SqlDataAdapter1.Fill(_ds)
_dt = _ds.Customers
ListBox1.DataSource = _dt
ListBox1.DisplayMember = "ContactName"
ListBox1.ValueMember = "CustomerID"
_postBack = True
End Sub

Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object,

ByVal

e As System.EventArgs) Handles ListBox1.SelectedValueChanged
If _postBack = True Then
MessageBox.Show("Finding customer...")
_dr = _dt.FindByCustomerID(ListBox1.SelectedValue)
TextBox1.Text = _dr.ContactName
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
_dr.ContactName = TextBox1.Text
MessageBox.Show(_dr.RowState.ToString)
End Sub

Why?, when I click the Button1, does the ListBox1_SelectedValueChanged

run?

To recreate:
All you need is Northwind.
I used the SqlDataAdapter wizard
Generated a typedDataset(no instance)

[Cor Ligthert]

Rodchar,

I have looked at your code, without testing it, had no time anymore to do it
real good, and therefore I did want to try it today, however I see now that
your question is resolved.

About the postback my question was exactly the same as from Imran even
before you posted this message.

Cor

"rodchar" <ro*****@discussions.microsoft.com>

Do you know how I can utilize my _postBack flag to make this work?

"Imran Koradia" wrote:

Since the listbox is databound, the index will change on filling the
dataset.
http://groups.google.com/groups?th=fa80dc67a61f9228
(look for a workaround in the posts above)

Imran.

"rodchar" <ro*****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com...

> Hey all,
>
>
> I've the following code:
>
> Dim _postBack As Boolean = False
> Dim _ds As New DataSet1
> Dim _dt As DataSet1.CustomersDataTable
> Dim _dr As DataSet1.CustomersRow
>
> Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
> SqlDataAdapter1.Fill(_ds)
> _dt = _ds.Customers
> ListBox1.DataSource = _dt
> ListBox1.DisplayMember = "ContactName"
> ListBox1.ValueMember = "CustomerID"
> _postBack = True
> End Sub
>
> Private Sub ListBox1_SelectedValueChanged(ByVal sender As Object,

ByVal

> e As System.EventArgs) Handles ListBox1.SelectedValueChanged
> If _postBack = True Then
> MessageBox.Show("Finding customer...")
> _dr = _dt.FindByCustomerID(ListBox1.SelectedValue)
> TextBox1.Text = _dr.ContactName
> End If
> End Sub
>
> Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles Button1.Click
> _dr.ContactName = TextBox1.Text
> MessageBox.Show(_dr.RowState.ToString)
> End Sub
>
> Why?, when I click the Button1, does the ListBox1_SelectedValueChanged

run?

>
> To recreate:
> All you need is Northwind.
> I used the SqlDataAdapter wizard
> Generated a typedDataset(no instance)
>