Solved

Object reference not set to an instance of an object

Posted on 2012-03-21
8
352 Views
Last Modified: 2012-03-23
I am trying to bind a reportViewer in c# 2010 windows application from Access 2007 query, the query is "select * from mytable where id=@id". I added parameters using Add and AddWithValue but both throws an error that "Object reference not set to an instance of an object." How can fix the problem?

this.qReportTableAdapter.Adapter.SelectCommand.Parameters.AddWithValue("@id",nInt.ToString());

or this.qReportTableAdapter.Adapter.SelectCommand.Parameters.Add("@id",OleDbType.Integer,1).Value=nInt;

this.qReportTableAdapter.Fill (this.dsReport.qReport);
this.reportViewer1.RefreshReport ();  

Please help.

Thanks ayha
0
Comment
Question by:ayha1999
  • 4
  • 4
8 Comments
 
LVL 16

Expert Comment

by:Kalpesh Chhatrala
ID: 37751027
Hi Ahya,

Check any one Object has null value that's why you get error.

Kalpesh
0
 
LVL 7

Author Comment

by:ayha1999
ID: 37751056
the value is already provided as "nInt"
0
 
LVL 16

Expert Comment

by:Kalpesh Chhatrala
ID: 37751081
may be qReportTableAdapter object is null.
0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 
LVL 7

Author Comment

by:ayha1999
ID: 37751095
where is the right place to add the parameter?  If I remove 'where' condition from the query and ádd parameter'from the code, it works without error.

thanks
0
 
LVL 16

Expert Comment

by:Kalpesh Chhatrala
ID: 37751109
"select * from mytable where id= " + nInt;

Don't use Parameter direct set value into your Query. like above
0
 
LVL 7

Author Comment

by:ayha1999
ID: 37751114
my query is "select * from mytable where id=@id"

then in the code

this.qReportTableAdapter.Adapter.SelectCommand.Parameters.AddWithValue("@id",nInt.ToString());
0
 
LVL 16

Accepted Solution

by:
Kalpesh Chhatrala earned 500 total points
ID: 37751118
0
 
LVL 7

Author Closing Comment

by:ayha1999
ID: 37760068
Thanks
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
MailAddress in vb 4 29
bound data table problem 2 34
Visual Studio npm 1 12
C# Service FileSystemwatcher isse 9 29
Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

821 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