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Simple scenario: a form and one text box (unbound), Text1.
If "" <> Text1 Then
MsgBox "Not Empty"
End If
The above code works. The expression ""<> Text1 evaluates to True if the text box contain characters.
The opposite doesn't work, regardless of the text box is empty or not:
If "" = Text1 Then ' or alternatively, False = ("" <> Text1)
MsgBox "Empty!"
End If
Can you clarify this issue?
799
Unbound control A control that doesn't have a source of data (such as a field or expression) is called an unbound control. You use unbound controls to display information, pictures, lines or rectangles. For example, a label that displays the title of a form is an unbound control.
Bound control – associated with a field in an underlying table. Use bound controls to display, enter, and update values from fields in the database. Unbound control – does not have a data source. Use unbound controls to display pictures and static text.
Bound controls are bound or connected to an underlying field in a table or query. You use bound controls to display, enter, and update field values in your database. The fields that you can add to a form using the Field List are all examples of bound controls.
So, a bound form has a RecordSource, a table or query to which the form is "tied" or "based". An unbound form does not have a RecordSource, that doesn't mean it can't contain data, but the programmer will have to bring that data in manually, where a bound form automatically is associated with some data.
The textbox is usually null if it does not contain anything, this is not the same as a zero length string (""). It can often be best to use:
If Trim(Text1 & "") = vbNullString
'Empty
This will be true if the textbox contains spaces, a zero length string or null.
157
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