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AutoComplete ComboBox in VB.Net

, 7 May 2002
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2 Simple Functions to call from ComboBox events to Autocomplete. Will work with Data Bound combos.
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This is an AutoCompleting ComboBox that works with Data Bound or Regular ComboBoxes in VB.NET. As you type the case is preserved but the remaining text is auto filled by the list items. When the Leave function is called the case is fixed and the index from the list is also selected if there is a matching item.

Sample Image - AutoComplete_ComboBox.gif

Call the corresponding functions from your Combobox's KeyUp and Leave events like so:

Private Sub cboName_Leave(ByVal sender As Object, ByVal e As System.EventArgs) 
                                                            Handles cboName.Leave
    Dim recRowView As DataRowView
    Dim recName As DB.tblNameRow


    'OPTIONAL: Now you can  do some extra handling if you want

    'Get the Selected Record from my Data Bound Combo (Return Type is DataRowView)
    recRowView = cboName.SelectedItem
    If recRowView Is Nothing Then Exit Sub

    'Display the Name Info (Row Type comes from my bound Dataset)
    recName = recRowView.Row
    lblAccountNum.Text = recName.AccountNum
    lblCompanyName.Text = recName.CompanyName

End Sub

Private Sub cboName_KeyUp(ByVal sender As Object, 
              ByVal e As System.Windows.Forms.KeyEventArgs) Handles cboName.KeyUp

    AutoCompleteCombo_KeyUp(cboName, e)

End Sub

Here are the Generic Functions for handling the events:

Public Sub AutoCompleteCombo_KeyUp(ByVal cbo As ComboBox, ByVal e As KeyEventArgs)
    Dim sTypedText As String
    Dim iFoundIndex As Integer
    Dim oFoundItem As Object
    Dim sFoundText As String
    Dim sAppendText As String

    'Allow select keys without Autocompleting
    Select Case e.KeyCode
        Case Keys.Back, Keys.Left, Keys.Right, Keys.Up, Keys.Delete, Keys.Down
    End Select

    'Get the Typed Text and Find it in the list
    sTypedText = cbo.Text
    iFoundIndex = cbo.FindString(sTypedText)

    'If we found the Typed Text in the list then Autocomplete
    If iFoundIndex >= 0 Then

        'Get the Item from the list (Return Type depends if Datasource was bound 
        ' or List Created)
        oFoundItem = cbo.Items(iFoundIndex)

        'Use the ListControl.GetItemText to resolve the Name in case the Combo 
        ' was Data bound
        sFoundText = cbo.GetItemText(oFoundItem)

        'Append then found text to the typed text to preserve case
        sAppendText = sFoundText.Substring(sTypedText.Length)
        cbo.Text = sTypedText & sAppendText

        'Select the Appended Text
        cbo.SelectionStart = sTypedText.Length
        cbo.SelectionLength = sAppendText.Length

    End If

End Sub

Public Sub AutoCompleteCombo_Leave(ByVal cbo As ComboBox)
    Dim iFoundIndex As Integer

    iFoundIndex = cbo.FindStringExact(cbo.Text)

    cbo.SelectedIndex = iFoundIndex

End Sub


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Comments and Discussions

QuestionThank you ! PinmemberMember 96251486-Feb-14 13:03 
GeneralRe: ComboBox Control in VB.Net PingroupAnkitaaguggi7-Oct-11 1:16 
GeneralMy vote of 5 Pinmemberprodigytechnologies28-Apr-11 2:16 
GeneralThank you PinmemberZestelle16-Sep-09 6:02 
AnswerProblem in Access database query PinmemberAyesha.Hafeez16-Dec-08 6:35 
GeneralRe: Problem in Access database query Pinmemberbwarehouse23-Feb-09 17:01 
GeneralAutocomplete Question Pinmembermchlcmprch29-Oct-07 14:29 
GeneralAutocomplete suggestion must try.. PinmemberSamee Dars16-Mar-08 23:44 
GeneralRe: Autocomplete suggestion PinmemberSamee Dars16-Mar-08 23:58 
GeneralRe: Autocomplete suggestion Pinmemberdibblm-Ohio9-Jan-09 6:31 
Generalthank Pinmemberansing20-Jan-07 4:31 
Generalthank Pinmemberansing20-Jan-07 4:30 
QuestionDroppedDown Pinmemberandrewf2211-Jan-07 12:16 
AnswerRe: DroppedDown Pinmemberpaulmcl26-Jan-07 4:17 
GeneralRe: DroppedDown Pinmembersephus615-Dec-08 12:24 
GeneralA little different code Pinmemberrtodosic31-Mar-06 8:15 
GeneralRe: A little different code ( version instead of c#) Pinmemberbwarehouse23-Feb-09 21:40 
Generalonly works when I type slowly Pinmembermiko_tnt21-Nov-05 6:20 
Hi mfs ... I saw this code few days ago and i use it, i also read the mesages all of u post to see how it works.
My problem ocurred when i wrote quickly.

I put the class that inherit the combobox taht one of u post but it didn't solve my problem. i can write fast and it capture all the characters i want, but when i wrote the first character that change the word and it isnt in my combo the cursor pass to the last position (max length)
and i continue writting there, so it leave a lot of blank spaces, but if i type slowly it doesnt happend, i can continue typing after the last char.

I hope u undertood my question and can solve ir .. thx

Pd .. sry 4 my english
QuestionWhat is DB.tblNameRow? Pinmembersanders.tec16-Sep-05 8:53 
AnswerRe: What is DB.tblNameRow? PinmemberJohann Lazarus2-Feb-09 14:00 
Generalneeds improvement Pinmembereletters_my30-Jan-05 20:48 
Generalautofill only works when I type slow PinsussRobert Gray20-Jun-04 15:59 
GeneralRe: autofill only works when I type slow PinmemberJoseph Hicks27-Jan-05 13:27 
GeneralRe: autofill only works when I type slow PinmemberTunca Bergmen3-Feb-05 4:07 
GeneralRe: autofill only works when I type slow PinsussAnonymous14-Apr-05 7:19 

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