Slicing a string to read a html document in VB - html

Question

I was hoping someone could help me figure out why this script will not return the link names. I am trying to return a sub-string from 'http://textfiles.com/directory.html' which just writes the link names to the console, but I am struggling. The main problem - as far as I can see - is in the 'do until' loop. The working code outputs the html text to the console more for my sake than anything else (it does this successfully), but this feature may also help you guys understand the total picture I am facing. Maybe after seeing the code/ understanding my goal you guys can see where I am going wrong AND/OR suggest a better method for achieving my goal. Thanks a ton!
Imports System.IO
Imports System.Text
Module Module1
Sub Main()
Dim line As String = ""
Dim lowBound As String = "<a href="""
Dim highBound As String = """>"
Console.WriteLine("Grab link names from textfiles.com")
Console.WriteLine("")
Dim siteName As String = "http://textfiles.com/directory.html"
Dim tmpString As StringBuilder = New StringBuilder
My.Computer.Network.DownloadFile(siteName, "C:\~\VisualStudio\BeginnerPractice\TextFileDotCom_GrabLinkNames\TextFileDotCom_GrabLinkNames\bin\debug\directory.html", False, 500)
Dim myReader As StreamReader = New StreamReader("C:\~\VisualStudio\BeginnerPractice\TextFileDotCom_GrabLinkNames\TextFileDotCom_GrabLinkNames\bin\debug\directory.html")
While Not IsNothing(line)
line = myReader.ReadLine()
If Not IsNothing(line) Then
tmpString.Append(line)
End If
End While
Dim pageText As String = tmpString.ToString
Console.WriteLine(pageText)
Dim intCounter As Integer = 1
Do Until intCounter >= Len(pageText)
Dim checkSub As String = Mid(pageText, intCounter + 1, (Len(pageText) - intCounter))
Dim positLow As Integer = InStr(checkSub, lowBound)
Dim positHigh As Integer = InStr(checkSub, highBound)
If (positLow > 0 And positHigh > 0) And positLow < positHigh Then
Dim indexLow As Integer = checkSub.IndexOf(lowBound)
Dim indexHigh As Integer = checkSub.IndexOf(highBound)
Dim foundLink As String = checkSub.Substring(indexLow + Len(lowBound), indexHigh - Len(highBound))
Console.WriteLine(foundLink)
intCounter = intCounter + (Len(lowBound) + Len(highBound) + Len(foundLink) - 1)
Else
intCounter = Len(pageText)
End If
Loop
Console.ReadLine()
myReader.Close()
My.Computer.FileSystem.DeleteFile("C:\~\VisualStudio\BeginnerPractice\TextFileDotCom_GrabLinkNames\TextFileDotCom_GrabLinkNames\bin\debug\directory.html")
End Sub
End Module