asp.net - how to search for a node in a xml file to see it exist -


I'm trying to get an XML file. Fields are always the same but occasionally are not included in it.

How do I find "name" in vb? & lt; Products & gt; & Lt; Name & gt; & Lt; FirstName & gt; John & lt; / FirstName & gt; & Lt; Last name & gt; Do & lt; / LastName & gt; & Lt; / Name & gt; & Lt; Age & gt; 24 & lt; / Age & gt; & Lt; Date of birth & gt; 4/5/1990 & lt; / DOB & gt; & Lt; / Products & gt;

I tried the code below and found a compilation, error BC30456: 'This includes' System.XML.Linq.XElement is not a member of 

 If the doctor ("product") as an XDocument in the form of a slow doctor. This includes ("name") then the doctor root.Element ("product") element ("name"). Remove () End if    
 
 
 The method of testing is available only to access it And then check that it is not  nothing , like this:  
  If the doctor Element ("product"). Element ("name") isnot 'nothing.   
 Note that instead of  doc.Element ("product")   doc.Root.Element ("product")  In your example XML, the  product   is  the basic element, however, it is dangerous to use the  element  property because it will throw an exception if the original element does not exist In other words, if  doc.Element ("product")  returns  nothing , then you can not go back and  can not remove anything . Element ("name") . So, to fix this, you have to do something like this:  
  if (Doctor is not Element ("product") and also ( Doctor "Element" ("product"). Element ("name") is not) then '... end if   
 but it's ugly very fast.  to access the elements. & Lt; & Gt; The easiest way to use, such as:  
  if the doctor & Lt; Products & gt; & Lt; Name & gt; .FirstOrDefault IsNot If nothing ... end ... if  nothing  is returned to  product  or  name  it will not throw an exception if Both of them either disappear or both disappear. If you want to throw an exception, you .  syntax, but just call  first  instead of  first and default .  
 Of course, I can tell that if you want to use XPath (Industry Standards) instead of Microsoft's proprietary LINQ-to-XML, then all this will be a bit easier, cleaner and more flexible . Technology, but it will be just fine, well, I think it has gone against my good decision, so long as I have already said, I can also give an example:

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