vb.net - Search textfile from certain string, read from that point - vb.net

Question

this is probably not that hard to do.
But I've got two text files. The first has got a list of certain keywords.
Each one if these keywords are fed into a combobox.
Now, when I choose one of the items from this combobox, I want to search the other textfile for the same keyword and read from that point to the next keyword. And then feed each line into a listbox. Hope I make myself understood.
Perhaps I should use an INI-file for this purpose, doesn't really matter for me.
The textfiles have this structure;
Textfile1:
London
Oslo
New York
Hamburg
Amsterdam
The second textfile has this structure;
Textfile2:
'London'
Apples
Oranges
Pears
'Oslo'
Pasta
Salami
Monkeyballs
'New York'
Dada
Duda
Dadadish
Etc etc.
Is this possible? The reason I want to do it this way is to create a fully dynamic system. One which relies fully on whatever information is stored in these textfiles. I'm gonna build pretty complex strings from these results later on.
So far, I've got this to read the first file and add each line to the combobox:
Dim oReadMenuFunction as System.IO.StreamReader
oReadMenuFunction = IO.File.OpenText("textfile1.txt")
Do While oReadMenuFunction.Peek <> -1
Dim LineIn as String = oReadMenuFunction.ReadLine()
Combobox.Items.Add(LineIn)
Loop

Answer 1

Here's a sample function you could use to parse your second file. It takes a keyword as argument and returns the associated items:
Function ReadData(ByRef keyword As String) As IEnumerable(Of String)
Dim result = New List(Of String)
Using reader = New StreamReader("file2.txt")
Dim line As String = reader.ReadLine()
Dim take = False
Do While line IsNot Nothing
If line.StartsWith("'") Then
take = False
End If
If String.Equals("'" + keyword + "'", line) Then
take = True
End If
If take And Not String.IsNullOrEmpty(line) And Not line.StartsWith("'") Then
result.Add(line)
End If
line = reader.ReadLine()
Loop
End Using
Return result
End Function
And you use it like this:
Dim items = ReadData("London")