Programming Forums - 'ErrMessage' is not declared

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garyelmer

Oct 23rd, 2007 1:53 PM

'ErrMessage' is not declared

I am VB 2005 Student

I'm trying to validate some user input using the code provided in the textbook.
It uses "ErrMessage" as shown in the code below:

'  Validate input for January



        If IsNumeric(txtJan.Text) Then

            Dim sngValue As Single

            sngValue = CSng(txtJan.Text)

            If sngValue < 0 Then

                txtJan.SelectAll()

                e.Cancel = True

            Else

                e.Cancel = False

            End If

        Else

            ErrMessage("The input must be a number")

            e.Cancel = True

        End If

I'm getting an Error Message saying that ErrMessage is not declared and the textbook doesn't have any details about this statement. What's wrong?
I could use MessageBox.Show("blah blah blah") but the textbook uses ErrMessage as shown above.

Gary

DaWei

Oct 23rd, 2007 2:30 PM

Re: 'ErrMessage' is not declared

Write a sub, ErrMessage, that takes a string and throws up the MessageBox with the appropriate decorations.

garyelmer

Oct 24th, 2007 12:37 AM

Re: 'ErrMessage' is not declared

We haven't gotten to writing sub-routines or functions yet so I settled for a MessageBox.

Thank you for the reply though.

Gary
1st Semester VB.Net Student

Booooze

Oct 24th, 2007 1:52 AM

Re: 'ErrMessage' is not declared

Just in case you're wondering, ErrMessage probably would have been declared somewhere in the code in your book. If it's not, might I suggest getting a new book? I know some books are horribly notorious for this. What book are you using?

garyelmer

Oct 24th, 2007 1:23 PM

Re: 'ErrMessage' is not declared

The Text Book is " Starting Out With Visual Basic 2005" by Tony Gaddis and Kip Irvine. Just in case you have the book the ErrMessage in their example code appears on page 315 and isn't declared anywhere in section 5.7 dealing with error validation. It's not a bad text in my newbial opinion but it did confuse the heck out of me until I decided to ignore it and call a MessageBox instead.

Gary

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