Question

check the last row of datagridview

Asked by: aarontham

I use VB.net 2008. i have a datagridview already populate data. my project required to loop throught the Datagridview to save it to database.
when it loop to the last row. which is empty row. i got below error

nullReferenceException was unhandled.

any solution?

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2009-04-23 at 03:56:08ID24348406
Topics

.NET

,

Microsoft Visual Basic.Net

,

Visual Studio

Participating Experts
4
Points
500
Comments
8

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. populate combobox in a datagridview in vb.net
    Hi Experts, I'm sorry I thought I had this sorted but when I came to put all the snipets of code together that I received from other questions it went badly wrong so I really need to go from scratch to get my head round this as I'm pretty new to vb.net and would like to do s...
  2. Picturebox in DataGridView
    How do I add a picturebox to a cell in a datagridview using vb.net 2005
  3. Totals row in Datagridview
    Hi, I'm working with VB.Net 2005, VS2005,Access. I am Not using ASP.Net. This is a Winform for office use, nothing to do w/ the web. I'm populating a datagridview with data from a table in access. I want to find a way to show totals of some of the columns. I would like to hav...
  4. Freezing DataGridView
    I have a DataGridView populated with 7 records. There will never be more than 7 and I will not allow the user to add a row. However, when the user gets to the last row, the DataGridView scrolls up, ruining the visualization. How do I stop the view from moving?
  5. remove Datagridview empty row
    i populate a datagridview with data. how to check and delete empty row. i need vb.net 2008 code

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: vs1784Posted on 2009-04-23 at 04:01:40ID: 24213643

put your code in try,catch and check the exception in catch block and handle it

 

by: aaronthamPosted on 2009-04-23 at 04:07:49ID: 24213685

i put try and catch i got below error msg.

Object reference not set to an instance of an object

 

by: vs1784Posted on 2009-04-23 at 04:22:55ID: 24213773

Can you post some code?

 

by: aaronthamPosted on 2009-04-23 at 04:31:28ID: 24213831


the code work. it will have error when it reach to the last row of the Datagridview.
my Datagridview is DGVPPSlot.

 For AA = 0 To DGVPPSlot.Rows.Count - 1                       
Dim Gstrsql As String = "Insert into Qitem (ItemID,QuoteID,StdMem) values('" & QDD & "','" & QID & "','" & Trim(DGVPPSlot(0, AA).Value.ToString) & "')"
cmd.CommandText = Gstrsql
cmd.Connection = con
cmd.ExecuteNonQuery()
Next AA

                                              
1:
2:
3:
4:
5:
6:

Select allOpen in new window

 

by: vs1784Posted on 2009-04-23 at 04:35:49ID: 24213869

Try this

If not try to declare cmd inside try block.

Try
For AA = 0 To DGVPPSlot.Rows.Count - 1                       
Dim Gstrsql As String = "Insert into Qitem (ItemID,QuoteID,StdMem) values('" & QDD & "','" & QID & "','" & Trim(DGVPPSlot(0, AA).Value.ToString) & "')"
cmd.CommandText = Gstrsql
cmd.Connection = con
cmd.ExecuteNonQuery()
Next AA
Catch ee As Exception
''''Log your error here using ee.Message
End Try

                                              
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:

Select allOpen in new window

 

by: OneMHzPosted on 2009-04-23 at 05:42:45ID: 24214331

Just a guess here, but if the last row is empty, the value you're getting from DGVPPSlot(0, AA).Value is probably null.  So calling ToString on it is probably why you're getting the NullReferenceException.  An alternative to the Try/Catch method described would be to put that value into a local variable, check it for null, and if it is, pass a default value to Gstrsql.  Something like:

Dim AAVal = DGVPPSlot(0, AA).Value
Dim AAString as String
If AAVal is Nothing
    AAString = "some default"
Else
    AAString = AAVal.ToString
End If
 
Dim Gstrsql As String = "Insert into Qitem (ItemID,QuoteID,StdMem) values('" & QDD & "','" & QID & "','" & Trim(AAString) & "')"
                                              
1:
2:
3:
4:
5:
6:
7:
8:
9:

Select allOpen in new window

 

by: amar31282Posted on 2009-04-23 at 10:08:28ID: 24217380

Try to run the following code and paste the complete error

Dim Gstrsql As String
For AA = 0 To DGVPPSlot.Rows.Count - 1                       
Gstrsql = "Insert into Qitem (ItemID,QuoteID,StdMem) values('" & QDD & "','" & QID & "','" & Trim(DGVPPSlot(0, AA).Value.ToString) & "')"
cmd.CommandText = Gstrsql
cmd.Connection = con
Try
cmd.ExecuteNonQuery()
Catch ex As Exception
errText.Text = ex.DetailedMessage (not sure check in intellisense)
Next AA
Finally
cmd.Dispose()
con.Close()

                                              
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:

Select allOpen in new window

 

by: GuitarRichPosted on 2009-04-24 at 02:54:51ID: 24223278

OneMHz is right. If you allow adding of rows in a datagridview, the last row will always be the new row with no data in it. So either change your loop to be count - 2 or check that the value is not null before adding it to the database.

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...