AutoCompleteComboBox

Public Class AutoCompleteComboBox
Inherits System.Windows.Forms.ComboBox

#Region " Windows Form Designer generated code "

Public Sub New()
MyBase.New()

'This call is required by the Windows Form Designer.
InitializeComponent()

'Add any initialization after the InitializeComponent() call

End Sub

'UserControl overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub

'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
components = New System.ComponentModel.Container()
End Sub

#End Region

Private _LastValue As New Object()

Protected Overrides Sub OnKeyPress(ByVal e As System.Windows.Forms.KeyPressEventArgs)

Dim _FindString As String

Select Case Asc(e.KeyChar)
Case Keys.Escape
Text = ""
Case Keys.Back
Try
Text = Text.Substring(0, SelectionStart - 1)
Catch ex As ArgumentOutOfRangeException
Text = ""
Finally
Call Find()
End Try
Case Else
Call Find()
End Select
e.Handled = True
End Sub

Private Sub Find()
Dim _PreFindTextLength As Integer = Text.Length
Dim _Position As Integer = Me.FindString(Text)
If _Position <> -1 Then
SelectedItem = Items(_Position)
SelectionStart = _PreFindTextLength
SelectionLength = Text.Length
_LastValue = SelectedItem
Else
SelectedItem = _LastValue
SelectionStart = 0
SelectionLength = _LastValue.Length
End If
End Sub

End Class

Have fun with it!

Craig