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  <library_materials>
    <material id="id01" name="m01">
      <instance_effect url="#m01-fx"/>
    </material>
    <material id="id02" name="m02">
      <instance_effect url="#m02-fx"/>
    </material>
  </library_materials>					

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            XmlDocument document = new XmlDocument();
            document.Load(@"Materials.dae");

            XmlNamespaceManager manager = new XmlNamespaceManager(document.NameTable);
            manager.AddNamespace("COLLADA", XElement.Load(@"Materials.dae").GetDefaultNamespace().NamespaceName);

            XmlNodeList xmlNodeList = document.SelectNodes("//COLLADA:library_materials", manager);

            foreach (XmlNode item in xmlNodeList)
            {
                this.Text += item.Name;
            }					

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  <library_materials>
    <material id="id01" name="m01">
      <instance_effect url="#m01-fx"/>
    </material>
    <material id="id02" name="m02">
      <instance_effect url="#m02-fx"/>
    </material>
  </library_materials>					

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            XmlDocument document = new XmlDocument();
            document.Load(@"Materials.dae");

            XmlNamespaceManager manager = new XmlNamespaceManager(document.NameTable);
            manager.AddNamespace("COLLADA", XElement.Load(@"Materials.dae").GetDefaultNamespace().NamespaceName);

            XmlNodeList mainXmlNodeList = document.SelectNodes("//COLLADA:library_materials", manager).Item(0).ChildNodes;

            foreach (XmlNode childItems in mainXmlNodeList)
            {
                this.label1.Text += childItems.Attributes.Item(0).Value;
                this.label2.Text += childItems.Attributes.Item(1).Value;
            }					

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            this.Text = document.SelectNodes("//COLLADA:library_materials", manager).Item(0).ChildNodes.Item(0).Attributes.Item(0).Value;
            this.Text = document.SelectNodes("//COLLADA:library_materials", manager).Item(0).ChildNodes.Item(0).Attributes.Item(1).Value;
            this.Text = document.SelectNodes("//COLLADA:library_materials", manager).Item(0).ChildNodes.Item(1).Attributes.Item(0).Value;
            this.Text = document.SelectNodes("//COLLADA:library_materials", manager).Item(0).ChildNodes.Item(1).Attributes.Item(1).Value;