Object reference not set to an instance of an object error on c#

Question

0.00/5 (No votes)

See more:

Am trying to get a cell value from gridview in repositoryItemGridLookUpEdit1_EditValueChanged event. But am getting null value only then error show like this "Object reference not set to an instance of an object" in that line.

How to get cell value in particular row from gridview in EditValueChanged Event ?

my code is this

C#

private void repositoryItemGridLookUpEdit1_EditValueChanged(object sender, EventArgs e)
    {
        GridLookUpEdit LookupEdit = sender as GridLookUpEdit;
        DataRowView SelectedDataRow = (DataRowView)LookupEdit.GetSelectedDataRow();



        gridView1.SetFocusedRowCellValue("Description", SelectedDataRow["ProductDescription"]);
        gridView1.SetFocusedRowCellValue("UoM", SelectedDataRow["UnitofMeasure"]);
        gridView1.SetFocusedRowCellValue("Quantity", SelectedDataRow["DefaultQuantity"]);
        gridView1.SetFocusedRowCellValue("Price", SelectedDataRow["MRPPrice"]);
        gridView1.SetFocusedRowCellValue("TaxInPercentage", SelectedDataRow["Taxid1"]);
        gridView1.SetFocusedRowCellValue("ProductKind", SelectedDataRow["ProductKind"]);

        getdisc = LookupEdit.EditValue.ToString(); // get display value & pass to comparision to find Discound

        object productkin = gridView1.GetRowCellValue(gridView1.FocusedRowHandle, gridView1.Columns["ProductDescrption"]);

        string productkind = productkin.ToString(); // Error Object reference not set to instance of object

        MessageBox.Show(productkind, "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }

Help me ?

Posted 28-Nov-13 22:50pm

srihari1904

Add a Solution

Comments

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 29-Nov-13 5:11am

Debug and see on which line it is throwing the exception.

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)

Karthik_Mahalingam · Answer 1 · 2013-11-28T23:11:00

Solution 2

Hi

this the common error while handling reference type object

Please make sure that the object is not null , before accessing its members , methods..

try this..

instead of

C#

productkin.ToString();

use

C#

Convert.ToString(productkin);

Posted 28-Nov-13 23:11pm

Karthik_Mahalingam

OriginalGriff · Answer 2 · 2013-11-28T22:55:00

So check in the debugger and look at the line:

C#

object productkin = gridView1.GetRowCellValue(gridView1.FocusedRowHandle, gridView1.Columns["ProductDescrption"]);

Look at the FocusedRowHandle, and gridView1.Columns["ProductDescrption"] and see what cell they are trying to return.

We can't - we don't have access to your data.