Programming Forums > Application Development > Visual Basic

garyelmer · Oct 23rd, 2007, 12:53 PM

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:

(Toggle Plain Text)

'  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, 1:30 PM

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

garyelmer · Oct 23rd, 2007, 11:37 PM

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, 12:52 AM

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, 12:23 PM

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

Oct 23rd, 2007, 12:53 PM	#1
garyelmer Newbie Join Date: Oct 2007 Posts: 8 Rep Power: 0	'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: (Toggle Plain Text) ' 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 ' 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 Last edited by DaWei; Oct 23rd, 2007 at 1:23 PM. Reason: Added code tags. Read the rules.

Oct 23rd, 2007, 1:30 PM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Re: 'ErrMessage' is not declared Write a sub, ErrMessage, that takes a string and throws up the MessageBox with the appropriate decorations. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Oct 23rd, 2007, 11:37 PM	#3
garyelmer Newbie Join Date: Oct 2007 Posts: 8 Rep Power: 0	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

Oct 24th, 2007, 12:52 AM	#4
Booooze Expert Programmer Join Date: Mar 2006 Location: Igloo Posts: 710 Rep Power: 3	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?

Oct 24th, 2007, 12:23 PM	#5
garyelmer Newbie Join Date: Oct 2007 Posts: 8 Rep Power: 0	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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Programming Forums > Application Development > Visual Basic

'ErrMessage' is not declared