Compare Listbox items With text file problem?

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VB

Hello developer community I am currently stuck on what seems to be a simple problem. I need to be able to compare the items in a listbox with the text in a text file once my scan has completed. The code I have so far is:

For Each line As String In resultsbox.Items
                If line.contains(md5reader.readtoend) Then
                    ListBox1.Items.Add(line)
                    Label7.Text = ListBox1.Items.Count.ToString
                End If
            Next line

Now the problem with this code I suspect is that if a match is found it will add all items from the list box it is comparing from instead of just the items that match the text file.

resultsbox is the object I wish to compare the lines to a text file
md5reader is my io stream reader by which my program reads the lines in the text to end
I then go to say listbox1 items add line if resultsbox items.contains md5reader.readtoend?


Is there any other method that might be faster or more reliable then the method im using?

Please advise

Thank you in advance!! :)