Is it possible to attach a msgbox to a parameter?

I have created a parameter in a query and the query is linked to a form. It is a date parameter. However it still aloows the user to enter an invalid date e.g. 31/04/07. I would like to attach a macro to the parameter to prevent the user from entering such invalid dates, using msgboxs and macro control-actions

Shola

To Verify the value of an entry before running the query do the following:

Create a form with a text box (For the date) And a Command Button

In the command button On Click command write code along these lines:

Private Sub cmdOK_Click()

If IsDate(txtDate.Value) = False Then

MsgBox "Please enter correct Date"
txtDate.SetFocus
Exit Sub
End If

DoCmd.OpenQuery "My Query"

End Sub

Then in the Query, in the criteria line for the date, use Build to set the query to look at txtDate on the form for the required value.

Regards

Carlos