Object reference not set to an instance of an object...

Posted on 2011-03-01
Last Modified: 2012-05-11

This following C# code snippet throwing an error when I execute in my program.

 ResultCode leResultCode = moSearch.WebDedupeContact(ref lsErrorInfo, ref loIXMLDoc, lsFirstName + " " + lsLastName, "", "", "", "", "", "", Constants.IntelliSearch.MinimumMatchScore);

The error is: Object reference not set to an instance of an object...

I have view the definition for the class ResultCode as shwon below:

ResultCode WebDedupeContact(ref string ErrorInfo, ref IXMLDOMDocument2 XMLDoc, string SlxContact, string SlxAccountID, string Address, string City, string State, string Postcode, string Country, short MinimumMatchScore);

And on the top of interface where we got this declaration also have these attribute as well for the interface:

What are these mean? and most importantly where could this error be generated from?
Question by:ube100
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
LVL 53

Accepted Solution

Dhaest earned 250 total points
ID: 35007972
Where do you get that error ?
Is the object moSearch initialized ?

Author Comment

ID: 35007978
Sorry Just a small correction:

ResultCode is not a class it is a enum class and that definition is for WebDedupeContact which was defined in a interfcace.

Author Comment

ID: 35007993
As soon as I hit this line:

ResultCode leResultCode = moSearch.WebDedupeContact(ref lsErrorInfo, ref loIXMLDoc, lsFirstName + " " + lsLastName, "", "", "", "", "", "", Constants.IntelliSearch.MinimumMatchScore);
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

LVL 53

Assisted Solution

Dhaest earned 250 total points
ID: 35008044
Check if one of your variables return null. I expect moSearch

(do you have somewhere in your code: YourType moSearch = new YourType())

Author Comment

ID: 35008116

moSearch has been initialized.
LVL 53

Expert Comment

ID: 35008138
Check all the other variables, fe ref lsErrorInfo, ref loIXMLDoc

Do you have that functions also in debug (perhaps there is an issue in that function)

Author Comment

ID: 35008280
I have check the moSearch and that is null when we executing it so what should look for?

 private iSearchSLX moSearch

public iSearchSLX Search
                return moSearch;
This is how it's been created. This code is perfectly working code but I'm investigating something at the moment and propbably it is not creating the object under the condition I'm working? How do I find out about what causing it to not to create that object? Something to with Singleton pattern?

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

In my previous two articles we discussed Binary Serialization ( and XML Serialization ( In this article we will try to know more about SOAP (Simple Object Acces…
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…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

740 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