Restricting data Entry on a form

[RaoAli]

I have form to record payment from a customer. I want to lock the payments details in text boxes on the form unless the user selects some customer from a customers combo.
hope i conveyed my idea :)

[jforbes]

I would recommend using this code provided by Allen Browne: http://allenbrowne.com/ser-56.html

Create a Subroutine that Locks the Form if a Customer isn't selected, and Unlocks if the Customer is selected. Then call the Subroutine from the Form's OnCurrent event and the Customer ComboBox AfterUpdate Event.
The Sub could look like this:

Private Sub secureForm()
    LockBoundControls(Me, (Len(Me.cboCustomer.Value)=0), "cboCustomer")
End Sub

[RaoAli]

thank you for the response, but what is this Lockboundcontro l()function?

[jforbes]

The LockBoundContro ls() Function is provided by the above link.
Here is a copy of it, but the link will give greater detail of what is happening:

Public Function LockBoundControls(frm As Form, bLock As Boolean, ParamArray avarExceptionList())
On Error GoTo Err_Handler
    'Purpose:   Lock the bound controls and prevent deletes on the form any its subforms.
    'Arguments  frm = the form to be locked
    '           bLock = True to lock, False to unlock.
    '           avarExceptionList: Names of the controls NOT to lock (variant array of strings).
    'Usage:     Call LockBoundControls(Me. True)
    Dim ctl As Control      'Each control on the form
    Dim lngI As Long        'Loop controller.
    Dim bSkip As Boolean
    
    'Save any edits.
    If frm.Dirty Then
        frm.Dirty = False
    End If
    'Block deletions.
    frm.AllowDeletions = Not bLock
    
    For Each ctl In frm.Controls
        Select Case ctl.ControlType
        Case acTextBox, acComboBox, acListBox, acOptionGroup, acCheckBox, acOptionButton, acToggleButton
            'Lock/unlock these controls if bound to fields.
            bSkip = False
            For lngI = LBound(avarExceptionList) To UBound(avarExceptionList)
                If avarExceptionList(lngI) = ctl.Name Then
                    bSkip = True
                    Exit For
                End If
            Next
            If Not bSkip Then
                If HasProperty(ctl, "ControlSource") Then
                    If Len(ctl.ControlSource) > 0 And Not ctl.ControlSource Like "=*" Then
                        If ctl.Locked <> bLock Then
                            ctl.Locked = bLock
                        End If
                    End If
                End If
            End If
            
        Case acSubform
            'Recursive call to handle all subforms.
            bSkip = False
            For lngI = LBound(avarExceptionList) To UBound(avarExceptionList)
                If avarExceptionList(lngI) = ctl.Name Then
                    bSkip = True
                    Exit For
                End If
            Next
            If Not bSkip Then
                If Len(Nz(ctl.SourceObject, vbNullString)) > 0 Then
                    ctl.Form.AllowDeletions = Not bLock
                    ctl.Form.AllowAdditions = Not bLock
                    Call LockBoundControls(ctl.Form, bLock)
                End If
            End If
            
        Case acLabel, acLine, acRectangle, acCommandButton, acTabCtl, acPage, acPageBreak, acImage, acObjectFrame
            'Do nothing
            
        Case Else
            'Includes acBoundObjectFrame, acCustomControl
            Debug.Print ctl.Name & " not handled " & Now()
        End Select
    Next
    
    'Set the visual indicators on the form.
    On Error Resume Next
    frm.cmdLock.Caption = IIf(bLock, "Un&lock", "&Lock")
    frm!rctLock.Visible = bLock
    

Exit_Handler:
    Set ctl = Nothing
    Exit Function

Err_Handler:
    MsgBox "Error " & Err.Number & " - " & Err.Description
    Resume Exit_Handler
End Function

Public Function HasProperty(obj As Object, strPropName As String) As Boolean
    'Purpose:   Return true if the object has the property.
    Dim varDummy As Variant
    On Error Resume Next
    varDummy = obj.Properties(strPropName)
    HasProperty = (Err.Number = 0)
End Function

[RaoAli]

I got this and worked fine...thank you once again :)