What is the correct way to dispose of a FileStream object when finished?

The correct method to dispose of a FileStream object properly is to utilize the using statement, as demonstrated in option D. This approach is advantageous because it ensures that the FileStream is automatically disposed of at the end of the block in which it is defined, even if an exception occurs.

By enclosing the FileStream instantiation within the using statement, the code automatically calls Dispose on the FileStream once the execution leaves the block, which is the recommended practice for managing resources like file handles. This not only helps in releasing the underlying resources but also simplifies the code, reducing the likelihood of resource leaks due to forgetting to call Dispose or Close explicitly.

Other methods, such as calling fs.Dispose() or fs.Close(), require you to remember to invoke these methods at the appropriate time, which increases the risk of forgetting to do so, particularly in error-prone areas of the code. Therefore, using the using statement is a best practice that enhances code clarity and correctness regarding resource management.