Solved

Operator is not valid for type 'DBNULL' and string....

Posted on 2004-09-07
7
3,085 Views
Last Modified: 2012-08-13
Hello experts!

I recently altered one of my datagrids I use and added a dropdownlist, a checkbox, and another simple textbox.  I setup my sql table like I always do for checkboxes and what not.  For some reason when you now edit a new row that's been added to the grid I get the following error:


Operator is not valid for type 'DBNull' and string "Service".
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Operator is not valid for type 'DBNull' and string "Service".

Source Error:


Line 206:                        If AddingNew = False And Not (Val Is Nothing) Then
Line 207:                              Select Case Val
Line 208:                                    Case "Service"
Line 209:                                          Return 1
Line 210:                                    Case "Parts"
 

Source File: c:\inetpub\wwwroot\BadChecks\datagrid1130test.aspx    Line: 208

How do I get it to recognize the empy/null sql field and move past it?  The code its hanging up on is here:

Function dgDropDown1GetIDX(ByVal Val As Object) As Integer
If AddingNew = False And Not (Val Is Nothing) Then
      Select Case Val
            Case "Service"
            Return 1
            Case "Parts"
            Return 2
            Case "B/S"
            Return 3
            Case "New Sales"
            Return 4
            Case "Used Sales"
            Return 5
            Case Else
            Return 0
      End Select
Else
Return 0
End If
End Function

Any ideas?  I use this function to get the value that is already in the sql table.  

Help!
0
Comment
Question by:jay-are
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 37

Expert Comment

by:gregoryyoung
ID: 12001079
If AddingNew = False And Not (Val Is Nothing) And not isdbnull(val) Then
0
 
LVL 37

Accepted Solution

by:
gregoryyoung earned 500 total points
ID: 12001083
or use Select Case (Val & "")
0
 

Author Comment

by:jay-are
ID: 12001577
Thanks for your feedback!

Will be testing...
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 18

Expert Comment

by:DotNetLover_Baan
ID: 12001948
Cool... Greg.. that's a nice trick... >> Select Case (Val & "") << ...   awsome...
0
 
LVL 37

Expert Comment

by:gregoryyoung
ID: 12002318
dbnull & "" = "" always :)
0
 

Author Comment

by:jay-are
ID: 12002719
Select Case (Val & "")

works perfect...so simple too!

Thanks!
0
 
LVL 37

Expert Comment

by:gregoryyoung
ID: 12003027
glad to hear it, let me know if you need anything else.

Cheers,

Greg
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create and use a custom WaterMark textbox class.  The custom WaterMark textbox class allows you to set the WaterMark Background Color and WaterMark text at design time.   IMAGE OF WATERMARKS STEPS Create VB …
Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

695 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question