ComboBox.SelectedIndexChanged Question

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Calvin Willman - 12 Dec 2006 12:30 GMT

I've got a databound combobox on a usercontrol in a VSTO app. I want to
handle the selected index changed event display/hide some other controls on
the form, which seems to be working fine in it self... but when I click the
button to submit the form, it seems to fire again, and I get a null
exception on the selectedindex...

The same thing happens with a radio button changed event in that is fires or
executes when the button/form is submitted...

I only want these events to fire when the controls are changed... not when
the button is clicked?

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AlBruAn - 14 Dec 2006 06:26 GMT

Have you tried disabling the event handlers for the combobox and your radio
buttons?

You might try something similar to the following:

private void button1_Click(object sender, EventArgs e)
{
    comboBox1.SelectedIndexChanged -= comboBox1_SelectedIndexChanged;
    radioButton1.CheckedChanged -= radioButton1_CheckedChanged;

    // Perform your save operation here

    comboBox1.SelectedIndexChanged += new
EventHandler(comboBox1_SelectedIndexChanged);
    radioButton1.CheckedChanged += new EventHandler(radioButton1_CheckedChanged);
}

HTH

Allen

> I've got a databound combobox on a usercontrol in a VSTO app. I want to
> handle the selected index changed event display/hide some other controls on
[quoted text clipped - 7 lines]
> I only want these events to fire when the controls are changed... not when
> the button is clicked?

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Calvin Willman - 14 Dec 2006 08:13 GMT

Thanks Allen,

I thought of doing that, but found that just calling the Focus method on a
label, before disabling the button meant that focus wasn't automatically
passed to the radiobutton resulting in the SelectedIndexChanged event
getting fired... as so it seems to work ok.

Thanks again.

> Have you tried disabling the event handlers for the combobox and your
> radio
[quoted text clipped - 34 lines]
>> when
>> the button is clicked?

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ComboBox.SelectedIndexChanged Question

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