json.net check if children exists - json

Question

I have some json and parse the content using json.net. Firstly I use the JToken and split the fields from a post into a list of objects and then read the values from each. The problem is that some of these objects sometimes have the fields and sometimes dont and not sure how to prevent a nullexception error from being called. Here is the json sample:
{"id": "dfdksfjaisdfdsjfksdjdfsdafernd"}
{"body": "test data for parsing"}
{"object": { "summary":"hello test data you trouble maker", "id" :"problem stuff",
"link": "http://testdata.com",
"objecttype": "link"
}}
{"user": { "name": "Joe Somebody", "age":"43", "location": { "name": "outer space"},
}
}
Now in some posts the location field is not present in user object which results in a null error in my code as shown below and also sometime the object object is in a different format as follows:
{"id": "dfdksfjaisdfdsjfksdjdfsdafernd"}
{"body": "test data for parsing"}
{"object": { "object":
{"summary":"hello test data you trouble maker", "id" :"problem stuff",
"link": "http://testdata.com",
"objecttype": "link"
}
}}
{"user": { "name": "Joe Somebody", "age":"43",
}
}
now if my code is as follows:
Dim results As List(Of JToken) = jobj.Children().ToList
If results.Count = 0 Then
Exit Sub
End If
For Each item As JProperty In results
item.CreateReader()
If item.Name = "id" Then
id = item.Value
End If
If item.Name = "actor" Then
author = item.Value("name").ToString
location = item.Value("location").Item("name").ToString
age = item.Value("age").ToString
End If
If item.Name = "object" Then
htext = item.Value("summary").ToString
csubject = item.Value("objectType").ToString
End If
Next
Then if location and object are different this code will not work. so how can I check to see if the location field is present and also if the object path is different with another object within it before the summary field.
EDIT:
Ok thought I figured it out with
If Not item.Value("location") Is Nothing Then
bla bla bla

Answer 1

Ok I guess it did work and null exception from illformed json:
If Not item.Value("location") Is Nothing Then
bla bla bla
and the same for the object
If Not item.Value("summary") Is Nothing Then
bla bla bla
else
htext = item.Value("object").Item("summary").tostring