Object reference not set to an instance of an object.

Question

1.00/5 (2 votes)

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C#

private void btnNext_Click(object sender, EventArgs e)
       {
           RadioButton rbProjectType;

           if (iPnlNumber == 1)
           {
               this.pnlInstallerGuide.Visible = false;
               this.pnlProjectType.Visible = true;
               lblInstallerGuide.Visible = false;
               lblProjectTitle.Visible = true;
               btnBack.Enabled = true;
               iPnlNumber = 2;
               if (!bBackbtn)                {
                   foreach (DataRow drParentElement in dsToReadXmlFile.Tables[cProject].Rows)
                   {
                       string sParentElement = drParentElement[cType].ToString() + drParentElement[cLanguage].ToString();

                       addRadioButtonControl(drParentElement[cValue].ToString(), sParentElement, ((Convert.ToInt32(drParentElement[cProject_Id].ToString()) + 1) * 35));
                   }
               }
           }

Posted 8-Apr-11 0:17am

bipin9

Updated 11-Apr-11 19:21pm

Venkatesh Mookkan

v4

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Eduard Keilholz 8-Apr-11 6:19am

What is your question?

Sandeep Mewara 8-Apr-11 6:20am

Had you given the exact line, we could have all told on the possible objects. Yet, the answer by me should be more than enough and you should be able to resovle it now.

2 solutions

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Sandeep Mewara · Accepted Answer · 2011-04-08T00:19:00

Solution 1

Object reference not set to an instance of an object

This error happens when you try to use a property of an object that is null.

A simple use of Visual studio DEBUGGER can tell you the object because of which it is happening. Just look at the stack trace and put a debugger on that line. Check the objects of that line and see if any one is null and you are trying to use that objects property. Handle the same.

Posted 8-Apr-11 0:19am

Sandeep Mewara

Comments

bipin9 8-Apr-11 6:40am

exception is found for cProject
foreach (DataRow drParentElement in dsToReadXmlFile.Tables[cProject].Rows)

Sandeep Mewara 8-Apr-11 6:42am

So, you say, issue resolved?
OR you are asking me what and where and how to resolve?

bipin9 8-Apr-11 7:00am

sorry i asked wrong question first time
yes where and how to resolve is it related to xml file if yes then how

Sandeep Mewara 8-Apr-11 7:06am

Did you try? Sounds like dsToReadXmlFile is null and you are trying to access it's table

bipin9 8-Apr-11 7:13am

thanks

Amund Gjersøe 8-Apr-11 7:42am

If that worked, then please be so polite as to mark the question as solved.

bipin9 8-Apr-11 7:48am

thnks

Sergey Alexandrovich Kryukov 9-Apr-11 1:36am

The good is what ends up well. My 5.
--SA

Abhinav S · Accepted Answer · 2011-04-11T19:17:00

Solution 2

Why don't you try debugging your code and check the values of all the objects to figure out which one is null?

Posted 11-Apr-11 19:17pm

Abhinav S