Accessing data in XML through XPath and C#

[machismo]

I have a following XML:

<?xml version="1.0" encoding="utf-8" ?> 
<catalog>
	<cd country="USA">
		<title>ABCD</title>
		<author>yash</author>
		<price>10.90</price>
	</cd>
	<cd country="UK">
		<title>XYZ</title>
		<author>John</author>
		<price>10.0</price>
	</cd>
	<cd country="USA">
		<title>GreatHits</title>
		<author>yash</author>
		<price>9.90</price>
	</cd>
</catalog>

I have filled a DropdownList with all the titles. Now how can I get the author and price of particular title when selected in the dropdownlist through XPath and C#.
I am using following method:

string fileName="Catalog.xml";
string title= DropDownList1.SelectedItem.ToString();
XmlDocument xdoc=new XmlDocument();
xdoc.Load(@"C:\Inetpub\Wwwroot\Xpath1\" +fileName);
string price= xdoc.SelectSingleNode("/catalog/cd/price[title='" + title "']").Value;

but this is not helping. It returns Full InnerXml of the file.