XPath select elements with specific attribute value?

[Ploedman]

I'm having problems selecting nodes with XPath. I'll show the example, xml file is shortened due to the extensive amount of data in the real one:This is the subset of the XML:\[code\]<?xml version="1.0" encoding="ISO-8859-1"?><design xmlns="namespace_hidden" createddate="2012-12-07" createdby="User" name="New Design"> ... <variables> <measurements> <measurement name="Measurement001"> <sample name="1"> <position>[0,0]</position> <variables> <qualitative name="bId"> <class>2193</class> </qualitative> </variables> </sample> ... <sample name="4"> <position>[3,0]</position> <variables> <qualitative name="Q2"> <class>V0</class> </qualitative> <qualitative name="Q3"> <class>V2</class> </qualitative> <qualitative name="Q4"> <class>V1</class> </qualitative> <quantitative name="Q5"> <unit>Percent</unit> <value>8</value> </quantitative> </variables> </sample> </measurement> <measurement name="Measurement002"> .. </measurement> ... </measurements></design>\[/code\]Now, im trying to select all variables under a specific sample, under a specific measurement.This is the querying method I use:\[code\]// Creating the navigatorvar doc = new XPathDocument(xmlDoc[0]);var navigator = doc.CreateNavigator();// Creating the namespace manager:XmlNamespaceManager nsMan = null;if (navigator.NameTable != null) { nsMan = new XmlNamespaceManager(navigator.NameTable); nsMan.AddNamespace("y", xmlNs); nsMan.PushScope();}// Executing the queryvar iterator = navigator.Select(string.Format("/y:design/y:measurements/y:measurement[name='{0}']/y:sample[name={1}]/y:variables/y:qualitative", currentMeasurement.Name, currentSample.Name), nsMan);\[/code\]When I use this query I get the first measurement and the first sample, so that works:\[code\]string.Format("/y:design/y:measurements/y:measurement[1]/y:sample[1]"\[/code\]but if I use this query:\[code\]"/y:design/y:measurements/y:measurement[name='Measurement001']/y:sample[1]"\[/code\]I dont get any resultsIn desperation I have also tried different combinations of '' around the attribute values to no success. What am I doing wrong?Best regards, and thanks for any help!Richard