Visual Basic Code of the Week (COTW)
Issue #40
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Requirements for this Issue

The source code in this issue is designed for Visual Basic 5.0 and above. It is geared towards the intermediate to advanced programmer. If you have any questions about this issue, please email us at

In this Issue

This issue introduces a class module to perform what we call combo box history management. A good example of this is the Find Dialog box in Visual Basic 5.0. It will store the last X number of strings you entered in the Find Dialog. Many professional applications perform this feature. This class allows you to perform the same feature in your applications.

Declarations for cComboHistory

Public ComboBoxControl As ComboBox
Public KeyName As String
Public MaxItems As Long

Public Sub Save()
Public Sub Load()
Public Sub AddToList(sData As String)

Declaration Descriptions


The Save method will use the App.Title as the primary key to store the combo box items. This is the text that appears in Project Description Field in Project Properties. The current implementation does not allow you to override this. If this is not acceptable, you will need to modify the source.

Sample Usage

This example shows how to use the cComboHistory class. It assumes there is a combo box called cmbFind on the form that you want to manage the history for.

    Dim moComboHist as New cComboHistory

    ' This would be called in Form_Load or some other place near
    ' the initialization of a form.  This will setup the cComboHistory
    ' class and load the combo box with the previously saved
    ' items.
    Set moComboHist.ComboBoxControl = cmbFind
    moComboHist.KeyName = "cmbQuickFind"

    ' This will add the below items to the combo box.  You might put
    ' this code under a Find button (as in this example) or an Ok button.
    ' We had a good use to put it in the KeyPress event to be called
    ' when Enter was pressed.
    moComboHist.AddToList "new item to add"
    moComboHist.AddToList cmbFind.Text

    ' probably want to call this on Form_Unload

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