how to display parent node attribute name in xmlDocument

Question

hi, im trying to display the attribute name of the parent node once the input matches a town name:

my xml is:

1. <phonebook>
2.   <area code="022">
3.     <town>mallow</town>
4.   </area>
5.   <area code="023">
6.     <town>bandon</town>
7.     <town>bray</town>     
8.   </area>
9.   <area code="024">
10.     <town>youghal</town>    
11.   </area>
12.   <area code="025">
13.     <town>fermoy</town>    
14.   </area>
15. </phonebook>

and method is:

 

1. private void btnGetNum_Click(object sender, EventArgs e)
3. {