Gridview error - Object reference not set to an instance of an object.

Question

0.00/5 (No votes)

See more:

I have a asp gridview on a page

VB

<asp:GridView ID="WebDataGrid1" runat="server" CellPadding="4" AutoGenerateColumns="false" ></asp:GridView>

I am trying to bind it to a datasource in code behind

VB

OracleDataAdapter da = new OracleDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);

            WebDataGrid1.DataSource = dt;
            WebDataGrid1.DataBind();

But on the line

C#

WebDataGrid1.DataSource = dt;

it gives the error "Object reference not set to an instance of an object".

while debugging the dt has values (10 records). But I can't understand why it is giving me this error.

Even though i have a gridView on my aspx page, on the code behind it shows "null" at runtime.- This is the cause of the problem.

What could be the solution?

please help.

Posted 16-Jul-13 2:39am

maverick12131

Updated 16-Jul-13 3:07am

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

sivakumar.mk · Answer 1 · 2013-07-16T02:46:00

hey pre check that your data table has records or not then assign to gridview then it will not work

F#

OracleDataAdapter da = new OracleDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            
        if(dt.Rows.Count>0)
               {
                     WebDataGrid1.DataSource = dt;
                     WebDataGrid1.DataBind();
               }
          else
               {
                     WebDataGrid1.DataSource = null;
                     WebDataGrid1.DataBind();

               }

Hitesh Gohel · Answer 2 · 2013-07-16T03:01:00

Solution 3

Hi Pleas try this,

OracleDataAdapter da = new OracleDataAdapter(cmd);
            Dataset ds = new Dataset();
            da.Fill(ds);
 
            WebDataGrid1.DataSource = ds;
            WebDataGrid1.DataBind();

Posted 16-Jul-13 3:01am

Hitesh Gohel

Comments

maverick12131 16-Jul-13 9:16am

what difference will it make anyway