looping to add 271 records into my dictionary it only add 150 then exit the subroutine. (VB.net 2015) - vb.net

Question

For VB.net 2015
I'm a new programmer. I've been warping my brain around this for 2 days. Can seem to see the problem. It seems I can only add 150 records to the dictionary. I'm not sure where its failing in the code. I'm not getting any errors or warnings.
Really hope someone can give me a hand.
Heres a link to my file I'm working with.
https://drive.google.com/file/d/0B1zf86jcRv49Y1lCMHRvNWt4UFk/view?usp=sharing
P.S. Sry about the crappy coding skill :-)
Imports System
Imports System.IO
Public Class Form1
Dim xx As Integer = 0
Private MainDataList As New Dictionary(Of String, List(Of String))
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim temp1 As List(Of String)
'MsgBox(xx)
If MainDataList.ContainsKey(TextBox1.Text) Then
temp1 = MainDataList.Item(TextBox1.Text)
Label1.Text = temp1(0)
Beep()
Else
Label1.Text = "Not Found"
Beep()
Beep()
End If
TextBox1.Text = ""
End Sub
Private Sub GetData()
Dim ReadDataLine(50000) As String
Try
' Open the file using a stream reader.
Using sr As New StreamReader("C:\Inventory\Invatory.csv")
'Dim line As String
' Read the stream to a string and write the string to the console.
ReadDataLine(0) = sr.ReadLine
Do While (sr.EndOfStream = False)
ReadDataLine(xx) = sr.ReadLine
'AddToList(ReadDataLine) ' pars data into main list
'MsgBox(sr.ReadLine)
xx = xx + 1
Loop
sr.Close()
'line = sr.ReadLine()
End Using
Catch e As Exception
'MsgBox(xx)
MsgBox("The file could not be read:")
MsgBox(e.Message)
End Try
'MsgBox(xx)
'xx = 0
For Each i As String In ReadDataLine
AddToList(i)
'MsgBox(xx)
'xx = xx + 1
Next
End Sub
Private Sub AddToList(data As String)
Dim barCode As String = ""
Dim steps As Integer = 1
Dim LastPos As Integer = 2
Dim datalist As New List(Of String)
Dim firstPass As Boolean = False
For i = 2 To Len(data)
'Find end of cell
If Mid(data, i, 1) = "," Then
If firstPass = False Then
barCode = Mid(data, LastPos, i - 2)
'MsgBox(Mid(data, LastPos, i - 2))
LastPos = i
firstPass = True
Else
Dim temp As Integer = i - LastPos
datalist.Add(Mid(data, LastPos + 1, temp - 1))
'MsgBox(Mid(data, LastPos + 1, temp - 1))
LastPos = i
End If
End If
Next
MainDataList.Add(barCode, datalist)
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
GetData()
Label1.Text = "Ready!"
Me.Show()
TextBox1.Focus()
End Sub
Private Sub Label1_Click(sender As Object, e As EventArgs) Handles Label1.Click
End Sub
End Class