Autocomplete dictionary from a RichTextBox - vb.net

Question

While this code works fine in my RichTextBox, how do you do it from a dictionary in VB?
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'AutoComplete.Add("do")
AutoComplete.Add("double")
AutoComplete.Add("Apple")
AutoComplete.Add("Car")
AutoComplete.Add("Table")
AutoComplete.Add("Plate")
How do you do this from a dictionary in VB?

Answer 1

So this isn't an actual .NET dictionary? Ambiguous title!
Assuming each line is a separate word to populate your 'dictionary':
Public Sub PopulateDict()
For Each word As String In File.ReadAllLines("path")
AutoComplete.Add(word)
Next
End Sub
Something like this, yes?

Answer 2

Simple, you just need to read in the dictionary text file, parse the words from it, and then add them to your ArrayList.
Here's an example:
Private AutoComplete As New ArrayList
Private Sub AddDictionary()
Try
' Create an instance of StreamReader to read from a file.
Using sr As StreamReader = New StreamReader("dictionary.txt")
Dim line As String
Dim pieces As String()
' Read every line in the file
' Split the line by the delimiter
' Add the individual pieces to the AutoComplete ArrayList
Do
line = sr.ReadLine()
pieces = line.Split(" ")
For Each piece In pieces
AutoComplete.Add(piece)
Next
Loop Until line Is Nothing
' Close the dictionary file StreamReader
sr.Close()
End Using
Catch E As Exception
' Let the user know what went wrong.
MsgBox("The dictionary file could not be read:\n" & E.message, _
MsgBoxStyle.Critical, _
"Error loading file!")
End Try
End Sub
Note: I don't know how your dictionary file is formatted, so in my example code I'm just splitting the lines into individual words using spaces.
You could call the AddDictionary() sub from your Form1_Load() method to add the words to the AutoComplete dictionary at startup.