Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

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Prepare for the Microsoft Certified Solutions Developer Certification Test. Use multiple choice quizzes with hints and explanations to boost your readiness. Excel on your test!

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Which statement is true regarding the NullReferenceException?

It is thrown when trying to access an object that has not been instantiated
It is caused by attempting to perform a division by zero
It indicates that a type is missing in the code
It occurs when an assembly cannot be found

The correct answer is: It is thrown when trying to access an object that has not been instantiated

The statement about the NullReferenceException being thrown when trying to access an object that has not been instantiated is indeed correct. This exception is specifically designed to alert developers to scenarios where their code attempts to dereference a null object reference. In programming languages like C#, if an object is declared but not initialized (meaning it points to null), any attempt to invoke a method or access a property on that object results in a NullReferenceException. Understanding this behavior is crucial for debugging and writing robust code. It encourages developers to properly check for null conditions and ensure that objects are instantiated before usage, thus preventing runtime errors that could lead to application crashes or unexpected behavior. The other choices refer to different types of exceptions or errors. For instance, attempting to perform a division by zero results in a different exception, while issues such as missing types or assembly references pertain to other aspects of application development that do not directly relate to the NullReferenceException itself.