Error to read XML file from Linq

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C#

XML

LINQ

WinForms

Hi Friends,

I am reading the XML file using Linq.
I have XML as below :

<?xml version="1.0" encoding="utf-8"?>
<results xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="TCore TResultsSchema.xsd" xmlns="TCore">
<SMS>
<message>
<msgStatus>Read</msgStatus>
<msgcenterno>8613800100500</msgcenterno>
<number>8613810162499</number>
<dateTime>2011-11-22 15:45:54</dateTime>
<text>I'm going to purchase a BMW</text>
</message>
<deleted />
<message>
<msgStatus>Read</msgStatus>
<msgcenterno>8613800100500</msgcenterno>
<number>8613810162499</number>
<dateTime>2011-11-22 15:46:38</dateTime>
<text>What do want for me</text>
</message>
<deleted />

I want to fill all that messages into the Generic list. So i had done code like below.

XDocument xmlDoc = XDocument.Load(new System.IO.StreamReader(strWorkingFolderPath + "\\physicalResults.xml"));

                List<SMS> lstsms = new List<SMS>();

                var childQuery = from child in xmlDoc.Element("results")
                                 .Element("SMS").Descendants("message")
                                 select child;

                foreach (XElement el in childQuery)
                {
                    SMS s = new SMS();
                    s.msgStatus = el.Attribute("msgStatus").Value;
                    s.msgcenterno = el.Attribute("msgcenterno").Value;
                    s.number = el.Attribute("number").Value;
                    s.dateTime = el.Attribute("dateTime").Value;
                    s.text = el.Attribute("text").Value;

                    lstsms.Add(s);
                }

I am getting error 'object reference not set to an instance of an object'.
Can any one please tell me where is the problem in this query?

Thank,
Viprat