Basic Name Sorting Program using VB.net - vb.net

Question

My teacher has instructed our class to create a basic word sorting program the 'old fashioned way' in visual basic. So comparing two array values, a and b, then if one is considered higher in the order than the other, swap them if not do nothing, continue until there are no more swaps. Here is the code I have so far:
Imports System.IO
Imports System
Public Class Form1
Public arrText As New ArrayList()
Private Sub btnImprt_Click(sender As Object, e As EventArgs) Handles btnImprt.Click
'Dim OpenAnswerFile As New OpenFileDialog
Dim objReader As New StreamReader("c:\Users\Adam\Desktop\unSortList.txt")
Dim sLine As String = ""
Dim arrText As New ArrayList()
Do
sLine = objReader.ReadLine()
If Not sLine Is Nothing Then
arrText.Add(sLine)
End If
Loop Until sLine Is Nothing
objReader.Close()
Dim i As Integer = 0
txtImport.Text = arrText(i)
End Sub
Private Sub btnSort_Click(sender As Object, e As EventArgs) Handles btnSort.Click
Dim i As Integer = 0
Dim a As Integer = i + 1
txtImport.Text = i
txtImport.Text = a
Dim Temp As String
Dim Change As Boolean = True
While Change = True
Change = False
For Each i In arrText(i) - 1
If String.Compare(arrText(i), arrText(i + 1)) = 1 Then
Change = True
Temp = arrText(i)
arrText(i) = arrText(i + 1)
arrText(i + 1) = Temp
End If
Next
i = 0
End While
txtSort.Text = arrText(39)
End Sub
My problem is that I am getting an Index error and I'm not sure where the error is located as the logic seems fine.
And yes I am aware of the sorting function built into Visual Basic. but as the teacher said. No cheating.

Answer 1

Your code has several flaws, which I'm ignoring and just concentrating on the sorting part, as your query is related to that. Replace your sort loop with the following and check again. The basic problem was that your loop should only iterate up to List.Count - 2 and not List.Count - 1 because you're comparing List(i) and List(i + 1) inside the loop:
Dim Temp As String
Dim Change As Boolean = True
While Change
Change = False
For i = 0 To arrText.Count() - 2
If String.Compare(arrText(i), arrText(i + 1)) = 1 Then
Change = True
Temp = arrText(i)
arrText(i) = arrText(i + 1)
arrText(i + 1) = Temp
End If
Next
End While