Textbox AutoCompleteSource in VB.NET

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Below is the code comes from a Class:

VB

Public Function GetVendorNames() As AutoCompleteStringCollection
        Dim X As New AutoCompleteStringCollection
        MyBase.ConnectToDB()
        Dim cmd As New SqlClient.SqlCommand("select distinct vendor from product", Cn)
        Dim dr As SqlClient.SqlDataReader
        dr = cmd.ExecuteReader
        While dr.Read
            X.Add(dr.Item(0).ToString)
        End While
        MyBase.DisconnectFromDB()
        cmd.Dispose()
        cmd = Nothing
        Return X
    End Function

Below is the code comes from Form:

VB

Private Sub Autopopulate(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtVendor.GotFocus
        Dim p As New Product
        txtVendor.AutoCompleteSource = AutoCompleteSource.CustomSource
        txtVendor.AutoCompleteCustomSource = p.GetVendorNames
        txtVendor.AutoCompleteMode = AutoCompleteMode.Suggest
        p = Nothing
    End Sub

When I place my cursor in the txtVendor Textbox, I expect autocomplete feature should generate the list of vendors. But, unexpectedly I am given an error as "ERROR CREATING WINDOW HANDLE" instantly when I enter into the text box. The error is showing on txtVendor.AutoCompleteMode=AutocompleteMode.Suggest statement.

Could someone help on this?

Posted 6-Jan-12 2:33am

Nara Har

Updated 6-Jan-12 2:36am

Estys

v3

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ckulasekaran · Answer 1 · 2012-01-06T21:28:00

Try below code.
Its working and to change the textbox properties(autocompletemode and autocompletesource)

VB

 Cn.Open()
Dim dt As New DataTable
Dim da As New OleDbDataAdapter("select ...........", Cn)
da.Fill(dt)
Dim row As DataRow
txtvendor.AutoCompleteCustomSource.Clear()
For Each row In dt.Rows
   txtvendor.AutoCompleteCustomSource.Add(row.Item(0).ToString())
Next

Kschuler · Answer 2 · 2012-01-06T03:54:00

I don't believe AutoComplete is intended to work the way you've described it. Typically it works as the user types in the textbox, not as soon as the focus is given, and even that is automatically handled for you. You can set the source up one time in the Load event of the form and it will handle showing the suggestions as the user types. Move the code you have to the Load event of the form and then try it out.

Textbox AutoCompleteSource in VB.NET

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