What Is Null Exception.

Null exception occurs when you try to access properties or method of an object using dot(.) notation if the object is not initialized or contain unknown(null) value.

Null exception usually occurs if you have wrong logic in the code. Sometimes, it is useful to leave the code as it is while developing the application. Otherwise, please do a null check before performing an operation on an object which you think it might become null.


if(obj!=null)
{
//perfrom operation
obj.DoSomeStuff();
}


else always put your potential code inside a try..catch..finally block and log a meaningful exception.


Please mark the answer as accepted, if you think it helped you.

hello @Sunil   
NullReferenceException is common. It indicates that you are trying to access member fields, or function types, on an object reference that points to null. It indicates a flaw in the code.
For better understanding you  can refer below links:

http://csharp.net-informations.com/string/string-null-cs.htm
http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it

Hi Sunil Kumar,

Try this below link

http://www.dotnetperls.com/nullreferenceexception

Ex.

if(StringVariable!=null)

{

            // do something here

}

Instead of that you can use below

if(!String.IsNullOrEmty("StringVariable))

{

            // do something here

}