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TabControl.OldValue property (Access)

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Use the OldValue property to determine the unedited value of a bound control. Read-only Variant.

Syntax

expression.OldValue

expression A variable that represents a TabControl object.

Remarks

The OldValue property contains the unedited data from a bound control and is read-only in all views.

Microsoft Access uses the OldValue property to store the original value of a bound control. When you edit a bound control on a form, your changes aren't saved until you move to another record. The OldValue property contains the unedited version of the underlying data.

You can provide your own undo capability by assigning the OldValue property setting to a control. The following example shows how you can undo any changes to text box controls on a form.

Private Sub btnUndo_Click() 
 
 Dim ctlTextbox As Control 
 
 For Each ctlTextbox in Me.Controls 
 If ctlTextbox.ControlType = acTextBox Then 
 ctlTextbox.Value = ctl.OldValue 
 End If 
 Next ctlTextbox 
 
End Sub

If the control hasn't been edited, this code has no effect. When you move to another record, the record source is updated, so the current value and the OldValue property will be the same.

The OldValue property setting has the same data type as the field to which the control is bound.

Example

The following example checks to determine if new data entered in a field is within 10 percent of the value of the original data. If the change is greater than 10 percent, the OldValue property is used to restore the original value. This procedure could be called from the BeforeUpdate event of the control that contains the data that you want to validate.

Public Sub Validate_Field() 
 
 Dim curNewValue As Currency 
 Dim curOriginalValue As Currency 
 Dim curChange As Currency 
 Dim strMsg As String 
 
 curNewValue = Forms!Products!UnitPrice 
 curOriginalValue = Forms!Products!UnitPrice.OldValue 
 curChange = Abs(curNewValue - curOriginalValue) 
 
 If curChange > (curOriginalValue * .1) Then 
 strMsg = "Change is more than 10% of original unit price." _ 
 & "Restoring original unit price." 
 MsgBox strMsg, vbExclamation, "Invalid change." 
 Forms!Products!UnitPrice = curOriginalValue 
 End If 
 
End Sub

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