combobox on form load

23 Aug 2006 4:13 AM

Ausclad

Hi,
I have a combo box that I want to populate, based on the selection of
another combo box.

So when combo box A is selected, combo box B is populated with related values.

I have this all working fine, except for on the forms loading. I have
combobox B being populated after combobox A_SelectedIndexChanged event fires.

However, on the form load, when I try to retrieve the value from
"selectedvalue" , field, it is giving me "System.Data.DataRowView". that is
the field isnt populated.

I dont understand why there is no value if the selectedindex changed event
is firing?

Can someone advise how I should be handling this. Even when the combo box
isnt yet populated, the selected index is showing as zero?.

thanks

23 Aug 2006 5:22 AM

Cor Ligthert [MVP]

Ausclad,

I have answered your question in another newsgroup.

Cor

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"Ausclad" <Ausc***@discussions.microsoft.com> schreef in bericht
news:CAF6F9AC-1D66-4652-8168-6C6CBFBB4FC7@microsoft.com...
> Hi,
> I have a combo box that I want to populate, based on the selection of
> another combo box.
>
> So when combo box A is selected, combo box B is populated with related
> values.
>
> I have this all working fine, except for on the forms loading. I have
> combobox B being populated after combobox A_SelectedIndexChanged event
> fires.
>
> However, on the form load, when I try to retrieve the value from
> "selectedvalue" , field, it is giving me "System.Data.DataRowView". that
> is
> the field isnt populated.
>
> I dont understand why there is no value if the selectedindex changed event
> is firing?
>
> Can someone advise how I should be handling this. Even when the combo box
> isnt yet populated, the selected index is showing as zero?.
>
> thanks
>
>

23 Aug 2006 7:49 AM

varun kanwar

Try the following code. take two comboboxes and use the following code.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
        ComboBox1.Items.Add("First")
        ComboBox1.Items.Add("Second")
        ComboBox1.Items.Add("Third")
        ComboBox1.SelectedIndex = 0
    End Sub

    Private Sub ComboBox1_TextChanged(ByVal sender As Object, ByVal e
As System.EventArgs) Handles ComboBox1.TextChanged
        If ComboBox1.Text = "First" Then
            ComboBox2.Items.Clear()
            ComboBox2.Items.Add("a")
            ComboBox2.Items.Add("b")
            ComboBox2.Items.Add("c")
            ComboBox2.SelectedIndex = 0
        ElseIf ComboBox1.Text = "Second" Then
            ComboBox2.Items.Clear()
            ComboBox2.Items.Add("d")
            ComboBox2.Items.Add("e")
            ComboBox2.Items.Add("f")
            ComboBox2.SelectedIndex = 0
        ElseIf ComboBox1.Text = "Third" Then
            ComboBox2.Items.Clear()
            ComboBox2.Items.Add("g")
            ComboBox2.Items.Add("h")
            ComboBox2.Items.Add("i")
            ComboBox2.SelectedIndex = 0
        End If
    End Sub