Complete List of System Exceptions in C#

✅ Commonly Used Exceptions

1. ArgumentException – Invalid argument passed to a method.
2. ArgumentNullException – Argument passed is null where it shouldn’t be.
3. ArgumentOutOfRangeException – Argument value is out of acceptable range.
4. ArithmeticException – Arithmetic operation errors (like division by zero).
5. ArrayTypeMismatchException – Type mismatch while storing an element in an array.
6. DivideByZeroException – Attempt to divide a number by zero.
7. FormatException – Invalid format conversion (e.g., converting letters to a number).
8. IndexOutOfRangeException – Accessing an invalid index in arrays or collections.
9. InvalidCastException – Invalid type casting operation.
10. InvalidOperationException – Method call is invalid for the object’s current state.
11. KeyNotFoundException – Accessing a non-existent key in a dictionary.
12. NotImplementedException – Method or operation is not implemented.
13. NullReferenceException – Trying to access a member of a null object.
14. ObjectDisposedException – Accessing a disposed object.
15. OutOfMemoryException – Insufficient memory to continue execution.
16. OverflowException – Arithmetic operation exceeds data type limits.
17. StackOverflowException – Call stack limit exceeded (often due to recursion).

📁 File and I/O Related Exceptions

1. DirectoryNotFoundException – Directory path is invalid or doesn’t exist.
2. DriveNotFoundException – Specified drive is unavailable.
3. EndOfStreamException – End of a stream is reached unexpectedly.
4. FileLoadException – Failure loading a file.
5. FileNotFoundException – Requested file not found.
6. IOException – General I/O operation errors.
7. PathTooLongException – File or directory path is too long.

🌐 Security and Permissions Exceptions

1. SecurityException – Security violation occurs.
2. UnauthorizedAccessException – Unauthorized access to a resource.

🧮 Serialization and Reflection Exceptions

1. InvalidProgramException – Code generation error by the compiler.
2. MemberAccessException – Access to class members fails.
3. MissingFieldException – Referencing a non-existent field.
4. MissingMethodException – Referencing a non-existent method.
5. NotSupportedException – Operation not supported.
6. ReflectionTypeLoadException – Type loading error via reflection.
7. TypeInitializationException – Failure during static constructor execution.
8. TypeLoadException – Failure to load a specified type.

🛡️ Threading and Task Exceptions

1. OperationCanceledException – Operation was canceled.
2. ThreadAbortException – Thread is being aborted.
3. ThreadInterruptedException – Interrupted while in a waiting state.
4. TimeoutException – Operation took too long to complete.

🗄️ Other Important Exceptions

1. AccessViolationException – Unauthorized memory access.
2. InsufficientExecutionStackException – Insufficient stack for execution.
3. PlatformNotSupportedException – Operation not supported on the platform.
4. RankException – Array dimension mismatch during an operation.
5. SynchronizationLockException – Object synchronization error.
6. UriFormatException – Invalid URI format.