How can I alter "On Error" code so that different code is run depending on when the error is found?

I have a workd=sheet that includes a UserForm that loads when a button is clicked.
The user can enter a code in 10 individual fields.
If the code already exists within the column of another worksheet then I would like a message appear that says that the user cannot enter a duplicate code.
I have employed a NamedRange to accommodate this that is used elsewhere in the workbook for other functions.
I thought I could use the On Error code to allow passage through the code if there were no matches with NamedRange as below, but this of course doesn't work.
How can I ammend please?
Des

On Error GoTo Stage3
If Me.TextBox101.Value = "" Then GoTo Stage3
zzz = 1
x2 = Application.WorksheetFunction.VLookup((Me.TextBox101.Value), Sheets("Tool Database").Range("Tools"), 3, 0)
GoTo Msg1
Stage3:
On Error GoTo Stage4
If Me.TextBox106.Value = "" Then GoTo Stage4
zzz = 2
x3 = Application.WorksheetFunction.VLookup((Me.TextBox106.Value), Sheets("Tool Database").Range("Tools"), 3, 0)
GoTo Msg1
Stage4:

...etc
spar-kleOperations DirectorAsked:
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AnuroopsunddCommented:
The general format is: =IF(ISERROR(the formula to be checked, what if the result is an error,what if the result is not an error ).

http://www.excel-examples.com/iserror.htm
Rory ArchibaldCommented:
Perhaps something like

Sub whatever()
' ....
    If Me.TextBox101.Value <> "" Then
        zzz = 1
        x2 = LookupTool(Me.TextBox101.Value)
    ElseIf Me.TextBox106.Value <> "" Then
        zzz = 2
        x3 = LookupTool(Me.TextBox106.Value)
    ' add more ElseIf statements as needed
    End If
'....
End Sub


Function LookupTool(varIn) As String
    Dim varVal
    varVal = Application.VLookup(varIn, Sheets("Tool Database").Range("Tools"), 3, 0)
    If IsError(varVal) Then
        LookupTool = ""
    Else
        LookupTool = varVal
    End If
End Function

Open in new window

spar-kleOperations DirectorAuthor Commented:
Thanks for your replies, really appreciated.

rorya: I can see that this will work with my workbook.

The variable zzz refers to the field number so that I can create a message for the user.

I can add code:
    If IsError(varVal) Then
        MsgBox ("A code entered has already been used")

How can I create a message, when the code is found within the "Tool Database" range that says, "The code entered in field " & zzz & " has already been used"
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Rory ArchibaldCommented:
If zzz > 0 then msgbox "The code entered in field " & zzz & " has already been used"

Open in new window


if I understood you right.
spar-kleOperations DirectorAuthor Commented:
Function LookupTool(varIn) As String
    Dim varVal
    varVal = Application.VLookup(varIn, Sheets("Tool Database").Range("Tools"), 3, 0)
    If IsError(varVal) Then
        LookupTool = ""
MsgBox "The code entered in field " & zzz & " has already been used"
    Else
        LookupTool = varVal
    End If
End Function

Open in new window


Sorry I meant, how do I declare the variable zzz, I presume "Public zzz As Integer" in the function module??

Also with this function I get my message "The code entered in field " & zzz & " has already been used" even when the code entered into theTextBox is not within the worksheet "Tool Database"

ie if the code IS IN the worksheet then I DO NOT get the message, if the code IS NOT within the worksheet I DO get the message ...I really need it the other way around

Actually it seems to revolve around the first TextBox
If the data in this TextBox is not present within the worksheet then I get the message, and all subsequent boxes seem to be ignored.
If the data in this TextBox is present within the worksheet then I do not get the message, and all subsequent boxes seem to be ignored.
Rory ArchibaldCommented:
Unfortunately, the original code you posted uses a lot of Goto statements so it was impossible for me to follow the actual intended flow. It sounds to me as though you want to do something like this:

   If Me.TextBox101.Value <> "" Then
        zzz = 1
        If LookupTool(Me.TextBox101.Value) <> "" then msgbox "The code entered in field " & zzz & " has already been used"
End If
    If Me.TextBox106.Value <> "" Then
        zzz = 2
        If LookupTool(Me.TextBox106.Value)  <> "" then msgbox "The code entered in field " & zzz & " has already been used"
End If
    ' add more If  statements as needed
   

Open in new window

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spar-kleOperations DirectorAuthor Commented:
I'm sorry about my ignorance, but I really appreciate your help.
This works brilliantly
Des
Rory ArchibaldCommented:
Glad to help.

Note that wasn't a criticism (although I don't like Goto statements except in error handling) - just a statement that without the full code I couldn't see where the code was jumping to. ;)
spar-kleOperations DirectorAuthor Commented:
...I didn't think you were criticising ...and I am truly ignorant!! :-)
but with with the help of you guys at EE I have been able to accomplish a great deal.
Really appreciate your support
Rory ArchibaldCommented:
Fair enough. :)
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