Visual Basic 2d array from .dat file

Dim Mileage As New System.IO.StreamReader("SDMileage.dat")
Dim strLine As String
Dim strSplit() As String

CHANGE THIS TO Mileage.Peek

Do While State.Peek <> -1
    strLine = Mileage.ReadLine
    strSplit = strLine.Split(",")

Try looping this way instead

Dim Mileage As System.IO.TextReader = New StreamReader("SDMileaage.dat")

do while ((strline = Mileage.ReadLine) <> nothing)

The Peek method might be fine, I just typically use the code above when working with text files, might be worth a shot...