Combobox exception - xpost/C# forum

Hi... Synposis...

Throws exception:
"Specified argument was out of the range of valid values."
Read on for the juicy tidbits.

MySimpleClassCol mscc=new MySimpleClassCol();

private void InitCombo()
{
// Doing this so bind op doesn't fire event
m_combo.SelectedIndexChanged -= new System.EventHandler...
mscc.Clear();
XmlNodeList nl=m_xml.DocumentElement.SelectNodes("/a/b/c/d");
foreach(XmlNode n in nl)
{
// Grab a bunch of strings from the node innerxml
MySimpleClass sc=new MySimpleClass(s1, s2, s3, s4);
mscc.Add(sc);
}
m_combo.DataSource=null;
m_combo.DataSource=mscc;
m_combo.DisplayMember="ComboName";
m_combo.SelectedIndex=-1;
m_combo.SelectedIndex=-1;
m-combo.SelectedIndexChanged += new System.EventHandler...
try
{
if(m_combo.Items.Count>0)
m_combo.SelectedIndex=0;
}
catch(Exception ex)
{
Debug.WriteLine(ex.Message);
}
}

InitCombo is called on Form load. It is also called whenever a change
is made to the underlying XML document.

Scenario 1:
1. Add a <d> node to the XML document
2. Save XML document to disk
3. InitCombo()
4. m_combo.SelectedIndex=m_combo.FindStringExact(newV alue);

This works.

Scenario 2:
1. Remove an inner <d> XML node - NOT the last one added
2. Save XML document to disk
3. InitCombo()
4. Leave m_combo.SelectedIndex=0;

This works.

Scenario 3:
1. Remove the last XML node added - always last child of parent node <c>
2. Save XML document to disk
3. InitCombo()

THIS BLOWS UP on:

try
{
if(m_combo.Items.Count>0) // which it is...
m_combo.SelectedIndex=0; // Throws exception
}

The exception thrown is:
"Specified argument was out of the range of valid values.
Parameter name: Index was out of range.
Must be non-negative and less than the size of the collection."

Nice... except that .Count is non-zero, 0 is non-negative, and less than
the size of the collection. And it ONLY happens when I remove the last child
in the XML... which corresponds to the last item in the list.

<a>
<b>
<c>
<d name="OKToDelete">
</d>
<d name="OKToDelete">
</d>
<d name="OKToDelete">
</d>
<d name="BLOWS_UP_ONDelete">
</d>
</c>
</b>
</a>

I have fiddled with the event handlers. I've tried NOT rebinding and just
repopulating the data set. I have all but waved a dead chicken over
the keyboard.

Could anyone throw me a bone here?

Thanks,
M.