What is the purpose of a
try-catch block in C#?
a. To handle exceptions that occur during the execution of code
b. To perform data encryption
c. To manage user sessions
d. To optimize database queries
Answer: a. To handle exceptions that occur during the execution of code
Which part of the
try-catch block contains the code that may throw an exception?
a. The
try block
b. The
catch block
c. The
finally block
d. The
throw block
Answer: a. The
try block
What does the
catch block do in a
try-catch statement?
a. It catches and handles exceptions thrown in the
try block
b. It executes code regardless of whether an exception was thrown
c. It performs data encryption
d. It manages user sessions
Answer: a. It catches and handles exceptions thrown in the
try block
Which keyword is used to define a block of code that will always execute, regardless of whether an exception was thrown?
a.
finally
b.
catch
c.
try
d.
throw
Answer: a.
finally
How do you specify multiple exception types to be caught by a single
catch block in C#?
a. By using a multi-catch block with parentheses, e.g.,
catch (ExceptionType1 | ExceptionType2 ex)
b. By using nested
catch blocks
c. By specifying each exception type in separate
catch blocks
d. By using
if-else statements inside the
catch block
Answer: a. By using a multi-catch block with parentheses, e.g.,
catch (ExceptionType1 | ExceptionType2 ex)
Can a
catch block handle exceptions of base classes that are derived from a more specific exception type?
a. Yes, a
catch block can handle any exceptions derived from the base exception type
b. No, it can only handle the exact type specified
c. Only if the base class is specified first
d. Only if the specific type is specified first
Answer: a. Yes, a
catch block can handle any exceptions derived from the base exception type
What is the purpose of the
throw statement inside a
catch block?
a. To rethrow the caught exception to be handled by an outer
catch block
b. To execute code after catching an exception
c. To initialize exception handling
d. To perform data encryption
Answer: a. To rethrow the caught exception to be handled by an outer
catch block
Can you have multiple
finally blocks in a
try-catch-finally statement?
a. No, only one
finally block is allowed
b. Yes, multiple
finally blocks can be used
c. Yes, but they must be placed inside
catch blocks
d. Yes, but only if they are nested
Answer: a. No, only one
finally block is allowed
What happens if an exception is thrown inside the
finally block?
a. The exception will propagate up the call stack after the
finally block executes
b. The exception is ignored and execution continues
c. The
finally block is skipped
d. The exception is logged automatically
Answer: a. The exception will propagate up the call stack after the
finally block executes
Which type of exceptions can be caught using a
catch block?
a. Any type of exception derived from
System.Exception
b. Only exceptions derived from
System.SystemException
c. Only
ApplicationException derived exceptions
d. Only
IOException derived exceptions
Answer: a. Any type of exception derived from
System.Exception
What should be avoided when writing a
catch block for handling exceptions?
a. Catching generic exceptions without specific handling logic
b. Logging detailed error information
c. Rethrowing exceptions after logging
d. Providing user-friendly error messages
Answer: a. Catching generic exceptions without specific handling logic
What is the result of using
catch (Exception ex) where
Exception is the base class for all exceptions?
a. It catches all exceptions derived from
Exception
b. It catches only
Exception type
c. It skips exceptions that are not of type
Exception
d. It does not handle any exceptions
Answer: a. It catches all exceptions derived from
Exception
Is it possible to use
try-catch blocks inside a
finally block?
a. Yes, you can use
try-catch blocks within a
finally block
b. No,
finally blocks cannot contain
try-catch statements
c. Only
catch statements are allowed inside
finally blocks
d.
finally blocks can only handle exceptions thrown outside
try-catch blocks
Answer: a. Yes, you can use
try-catch blocks within a
finally block
What does the
Exception class provide in C#?
a. Basic functionality for all exceptions, including properties like
Message and
StackTrace
b. Methods for performing arithmetic operations
c. Methods for managing user sessions
d. Methods for handling database queries
Answer: a. Basic functionality for all exceptions, including properties like
Message and
StackTrace
How can you avoid exception handling performance overhead?
a. By minimizing the use of
try-catch blocks and handling exceptions only when necessary
b. By using
try-catch blocks for every line of code
c. By placing all code inside a single
try block
d. By avoiding logging errors
Answer: a. By minimizing the use of
try-catch blocks and handling exceptions only when necessary
What is the main difference between
try-catch and
try-catch-finally blocks?
a.
try-catch handles exceptions, while
try-catch-finally also ensures execution of code in the
finally block
b.
try-catch handles exceptions, while
try-catch-finally skips exceptions
c.
try-catch is used for error logging, while
try-catch-finally manages database connections
d.
try-catch handles non-exception scenarios, while
try-catch-finally handles exceptions
Answer: a.
try-catch handles exceptions, while
try-catch-finally also ensures execution of code in the
finally block
Can a
catch block catch an exception thrown from within another
catch block?
a. Yes, as long as it is within the same
try block
b. No,
catch blocks cannot catch exceptions from other
catch blocks
c. Only if the
catch blocks are nested
d. Only if the
catch blocks are on different threads
Answer: a. Yes, as long as it is within the same
try block
Which method can be used to log exception details in a
catch block?
a.
ILogger.LogError()
b.
Console.WriteLine()
c.
Trace.WriteLine()
d.
File.AppendAllText()
Answer: a.
ILogger.LogError()
When should you use a
catch block to handle specific exceptions?
a. When you need to handle different types of exceptions in a custom manner
b. When you want to log all exceptions in the same way
c. When you want to avoid using a
finally block
d. When you do not need to handle exceptions
Answer: a. When you need to handle different types of exceptions in a custom manner
What should you include in the
catch block to provide useful debugging information?
a. Exception details such as message and stack trace
b. User input values
c. Application performance metrics
d. Database connection strings
Answer: a. Exception details such as message and stack trace
How does the
catch block affect program flow when an exception is thrown?
a. It transfers control to the
catch block and skips the remaining code in the
try block
b. It continues execution of the code in the
try block
c. It restarts the
try block execution
d. It executes the
finally block only
Answer: a. It transfers control to the
catch block and skips the remaining code in the
try block
What happens if no
catch block is provided for a
try block?
a. The exception propagates up the call stack and needs to be handled by a higher-level
catch block
b. The application crashes immediately
c. The
finally block executes, ignoring the exception
d. The code inside the
try block continues executing
Answer: a. The exception propagates up the call stack and needs to be handled by a higher-level
catch block
Can you use a
catch block to handle multiple types of exceptions in a single block?
a. Yes, by using multi-catch syntax in C#
b. No, each exception type needs a separate
catch block
c. Yes, but only if the exceptions are derived from the same base class
d. No, only
ApplicationException can be handled this way
Answer: a. Yes, by using multi-catch syntax in C#
What is the benefit of using
try-catch blocks in your code?
a. To handle and recover from runtime errors gracefully
b. To manage application state
c. To improve database performance
d. To handle user input validation
Answer: a. To handle and recover from runtime errors gracefully
In which scenario is it appropriate to use a
finally block?
a. When you need to execute code regardless of whether an exception occurred or not
b. When you want to log an error message
c. When you want to handle specific exceptions
d. When you need to catch exceptions thrown in other
catch blocks
Answer: a. When you need to execute code regardless of whether an exception occurred or not
How can you use
try-catch blocks to manage resources such as file handles or database connections?
a. By closing or disposing resources in the
finally block
b. By closing resources in the
catch block
c. By initializing resources in the
try block
d. By avoiding the use of resources in
try-catch
Answer: a. By closing or disposing resources in the
finally block
Can you use
throw inside a
catch block to create a new exception?
a. No,
throw can only rethrow the caught exception
b. Yes, you can use
throw new Exception() to create a new exception
c. Yes, but only if it is a custom exception
d. No, you must use
throw with existing exceptions
Answer: b. Yes, you can use
throw new Exception() to create a new exception
How do you ensure that the
finally block executes even if an exception occurs in the
try block?
a. By placing necessary code in the
finally block
b. By using a
catch block to handle exceptions
c. By avoiding exceptions in the
try block
d. By using
throw statements in the
finally block
Answer: a. By placing necessary code in the
finally block
What is the result of using
throw without any arguments in a
catch block?
a. It rethrows the original exception
b. It creates a new exception
c. It ignores the current exception
d. It ends the application abruptly
Answer: a. It rethrows the original exception
What should be included in the
catch block to handle a
FileNotFoundException?
a. Code to handle the case when a file is not found, such as providing an error message to the user
b. Code to handle all exceptions generically
c. Code to encrypt files
d. Code to initialize file system resources
Answer: a. Code to handle the case when a file is not found, such as providing an error message to the user
Can you have nested
try-catch blocks in C#?
a. Yes, you can have
try-catch blocks nested inside each other
b. No, nested
try-catch blocks are not allowed
c. Only
catch blocks can be nested
d. Only
try blocks can be nested
Answer: a. Yes, you can have
try-catch blocks nested inside each other
How can you handle exceptions specific to different parts of a program using
try-catch blocks?
a. By placing specific
try-catch blocks around different code sections
b. By using a single generic
catch block for the entire application
c. By placing all code inside a single
try block
d. By handling exceptions in the
finally block
Answer: a. By placing specific
try-catch blocks around different code sections
What is the best practice when using
try-catch blocks to handle exceptions?
a. To handle exceptions at the appropriate level and avoid catching exceptions that are not relevant to the current context
b. To catch all exceptions and ignore the details
c. To use
try-catch blocks for every line of code
d. To avoid using
try-catch blocks entirely
Answer: a. To handle exceptions at the appropriate level and avoid catching exceptions that are not relevant to the current context
Can you use a
catch block to handle exceptions thrown by asynchronous methods?
a. Yes, by using
await and
try-catch blocks around asynchronous method calls
b. No,
catch blocks cannot handle exceptions from asynchronous methods
c. Only synchronous
catch blocks can handle asynchronous exceptions
d. Only
finally blocks can handle exceptions from asynchronous methods
Answer: a. Yes, by using
await and
try-catch blocks around asynchronous method calls
Which exception handling approach is recommended for critical application errors?
a. Using
try-catch blocks with logging and error handling
b. Ignoring the errors and allowing the application to crash
c. Using
try-catch blocks without logging
d. Handling errors only in the
finally block
Answer: a. Using
try-catch blocks with logging and error handling
What is the primary goal of exception handling in ASP.NET applications?
a. To gracefully handle and recover from unexpected errors
b. To manage user sessions
c. To optimize database performance
d. To improve user interface design
Answer: a. To gracefully handle and recover from unexpected errors
