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a wrong example?

Posted on 1999-01-15
Medium Priority
Last Modified: 2010-05-03
I got following example from a book and I think that is wrong and did my currection. Do you agree?

If your Visual Basic procedure needs to know whether a form's field named Hours Worked has data, the procedure can check it with an If statement, as follows:

If IsNull(txtHoursWorked) Then
   msg = MsgBox("You didn't enter hours worked!", vbOKOnly)
Else                   ' Thank them for the good hours
   msg = MsgBox("Thanks for entering hours worked!", vbOKOnly)
End If

My currection:
If txtHoursWorked = "" Then
   msg = MsgBox("You didn't enter hours worked!", vbOKOnly)
Else                   ' Thank them for the good hours
   msg = MsgBox("Thanks for entering hours worked!", vbOKOnly)
End If
Question by:learn
  • 2
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LVL 10

Accepted Solution

caraf_g earned 160 total points
ID: 1456552
I guess txtHoursWorked is a text box.

In that case yes.

better even would be to explicitly state the property you are looking for so:
If txtHoursWorked.Text = "" Then

Also, do you allow the user to enter spaces. If the user enters 3 spaces in the text box, with the above code, since "   " is different from "" it will say "Thanks".

To stop that:
If Trim(txtHoursWorked.Text) = "" Then

LVL 13

Expert Comment

ID: 1456553
Yes, your cOrrection is Correct.

Author Comment

ID: 1456554
To caraf_g:

Thank you for your excellent answer. Yes, that is a text box which is called "field" in that book.
That example is for describing how to use NULL! I should find another book to lean VB :-(

To Mirkwood:

Yes, I was right...except "currection". Thank you.
LVL 10

Expert Comment

ID: 1456555
so you'll accept my answer then?

Author Comment

ID: 1456556
To caraf_g

Yes and increase the points a little bit.

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