SelectNodes return null

[EDN Admin]

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I have sample code that retrieves value from xml string, below:<br/>
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string xmlstring=<br/>
@"<?xml version=""1.0"" encoding=""utf-8""?><br/>
<SubjectsViewModel xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema" <br/>
<Subjects><br/>
<SubjectModel><br/>
<Id>4</Id><br/>
<ThemeId>1</ThemeId><br/>
<SubjectTexts><br/>
<SubjectTextModel><br/>
<Id>7</Id>
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</SubjectTextModel><br/>
</SubjectTexts><br/>
</SubjectModel><br/>
</Subjects><br/>
</SubjectsViewModel>";<br/>
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XmlDataDocument xml = new XmlDataDocument();<br/>
xml.LoadXml(xmlstring);<br/>
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XmlElement root = xml.DocumentElement;<br/>
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XmlNodeList nodelist = root.SelectNodes("/SubjectsViewModel/Subjects/SubjectModel");<br/>
foreach (XmlNode item in nodelist)<br/>
{<br/>
string id = item.SelectSingleNode("./Id").InnerXml;<br/>
string subjectTitle = item.SelectSingleNode("./SubjectTexts/SubjectTextModel/Id").InnerXml;<br/>
Console.WriteLine(id+" "+subjectTitle);<br/>
}<br/>
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It works on my pc, but it failed on server with the error:<br/>
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Object reference not set to an instance of an object<br/>
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On<br/>
<br/>
foreach (XmlNode item in nodelist)<br/>

The default namespace is being used. Is it something to do with namespace?

Any idea would be very much appreciated!

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