asp.net - I'm having trouble querying an XDocument using LINQ -

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I am new to LINQ so that I gather, I have some syntax wrong. I have seen many examples online, but everyone seems to have their own style.

Here is the XML data I ask: 

   & Lt; / Reaction & gt; & Lt; Reaction type = "object" id = "unknown" & gt; & Lt; Normal phenomenon = "position" privilege = channel = "sip / 452-000006fc" "call" calleridnum = "452" calleridname = "which" connectedlinenum = "430" connectedlinename = "device" accountcode = "" channelstate = "6" channelstatedesc = "Top" context = "macro-dial-one" extension = "s" priority = "37" seconds = "54" bridgedchannel = "br /> 430-000006fd" bridgeduniqueid = "1363822334.1829" uniqueid = "1363822334.1828" /> ; & Lt; / Reaction & gt; & Lt; Reaction type = "object" id = "unknown" & gt; & Lt; Normal phenomena = "position" privilege = channel = "sip / 430-000006fd" "call" calleridnum = "430" calleridname = "device" connectedlinenum = "452" connectedlinename = "which" account = "" state = "up" bradcchannel = "SIP / 452-000006 FC" Bridgedinidid = "1363822334.1828" unnatural = "1363822334.1829" /> & Lt; / Reaction & gt; & Lt; Reaction type = "object" id = "unknown" & gt; & Lt; General Event = "Status Completed" item = "2" /> & Lt; / Reaction & gt; & Lt; / Ajax-feedback & gt;   
 And here I have so far:  
  function ParseXML (string as xmlDocument) string xdoc as XDocument = XDocument.Load (new XmlNodeReader (Status XML) string as stringbilder = new stringbilder () Dim query = Xdock in Zedrick.Descendants ("generic") _ where generic. No specialty ("privilege") and general. Attribute ("privilege") value = "call" _ Select connectlinenum = generic.Attribute ("connectedlinenum"). ToString, _ calleridnum = generic.Attribute ("calleridnum"). Each I query parsed.Append (i.connectedlinenum) .Append (for ToString "") .Append (i.calleridnum) .Append (vbCrLf) Next Return Parsed.ToString End Function   
 My guess is that I am misunderstood that my  normal  object is supposed to work, because in my code, in my reference,  NullReferenceException  gets when I referenced it Try to do   
 
 
 I'm not familiar with XML parsing, but none of the two you have  privileges < / Code> not attribute, can this error occur?  
 In that case, what happens if you change from  and  to  plus  in the  where  section? This way, it will not evaluate the latter part of the statement if there is no  privilege  attribute.

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