Combo Box, If Then Statement

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

Code:

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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

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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.

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:

Code:

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If ConfigComboBox.SelectedItem = 0 Then

---

Thanks

Code:

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Minimal Removals [Quick]" to type 'Double'

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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!

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" ..

Code:

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    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

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

Code:

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

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

Gremmy..

Yup, selectedindex works fine.

One note though:

Code:

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chkbxKas.Checked = True

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Works.

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

Code:

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chkbxKas.CheckState = CheckState.Checked

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

From the VB6 tags:

Code:

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vbChecked
vbUnchecked
cbGrey

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1,0,-1

as I recall.

Quote:

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From the VB6 tags:

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