Predictive text in Richtextbox in vb

Question

I have almost finished with my text editor in Visual basic.. And the last thing I want to add in my project is a sub which will show a Drop-Down menu each time the user adds a letter(character) in the richtextbox..For example when the user types a in the richtextbox, the program will show a Drop-Down menu with all words whose first letter is a.. Then if user types b after a then the Drop-Down menu will have all words whose first two letters are ab..The Drop-Down menu will get its words from a text file in that path: C:/Desktop/txtfile.txt

Answer 1

You can use TextBox.AutoCompleteMode Property to suggest or append the Predictive text in the textbox or richtextbox.

_{(source: net-informations.com)}

The following VB.Net program add some string values to AutoCompleteStringCollection and display as Autocomplete TextBox while entering text:

Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TextBox1.AutoCompleteMode = AutoCompleteMode.Suggest
        TextBox1.AutoCompleteSource = AutoCompleteSource.CustomSource

        ' You can read the custom source file
        ' for example: File.ReadAllLine("C://Desktop//txtfile.txt")
        Dim DataCollection As New AutoCompleteStringCollection()

        addItems(DataCollection)
        TextBox1.AutoCompleteCustomSource = DataCollection
    End Sub
    Public Sub addItems(ByVal col As AutoCompleteStringCollection)            
        col.Add("Abel")
        col.Add("Bing")
        col.Add("Catherine")
        col.Add("Varghese")
        col.Add("John")
        col.Add("Kerry")
    End Sub
End Class

Reference Here