Combo Box, If Then Statement

[weirddemon]

Hi,

I'm trying to create a combo box that, when I select an item, certain checkboxes become checked. I'm sure I can use an If Then statement to do that, but I'm running into a problem and I can't figure it out. I'll post the code below. If my code looks fine, I'll post the error. But, I'm sure I'm messing up somewhere

Thanks

Private Sub ConfigComboBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ConfigComboBox.SelectedIndexChanged
        If ConfigComboBox.SelectedItem = 0 Then
            chkbxKas.Checked = True
        End If
    End Sub

[dglienna]

It looks like it will compile, but without trying it, it's not worth it to look. OTOH, if you had posted the error and the line # along with the code, it would probably have been answered by now.

[weirddemon]

Sorry. I just thought I may have messed the code up.

Here's the error:

An unhandled exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll

Additional information: Conversion from string "Minimal Removals [Quick]" to type 'Double' is not valid.

It occurs on line:

If ConfigComboBox.SelectedItem = 0 Then

Thanks

[dglienna]

Minimal Removals [Quick]" to type 'Double'

That says it all. Your item selected isn't type Double, and there is no conversion available.

After you type the = sign, it should give you the available options. Use one of them!

[GremlinSA]

The question here is what type of data is bound to the combobox.. You probably got a "List (Of {Object})" as the bound data.. the better bet here then would be to use "Selectedindex" ..

    Private Sub ConfigComboBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ConfigComboBox.SelectedIndexChanged
        If ConfigComboBox.SelectedIndex = 0 Then
            chkbxKas.Checked = True
        End If
    End Sub

"Selecteditem" will return the selected {Object} , of the bound data .. where you can then use

 Dim ThisItem as {Object} = Ctype(ConfigComboBox.SelectedItem, {Object})

where you can now check exactly what item has been selected..

Gremmy..

[TT(n)]

Yup, selectedindex works fine.

One note though:

chkbxKas.Checked = True

Works.

But I've found that it's inconsistent, and this works every time:

chkbxKas.CheckState = CheckState.Checked

I assume because there is 3rd possible state, it's best to be explicit.

[dglienna]

From the VB6 tags:

vbChecked
vbUnchecked
cbGrey

1,0,-1

as I recall.

[TT(n)]

From the VB6 tags:

Ahh the good old days,....
I still love to backport to vb6 today though.