Exceptions

System Exception

Exception	Condition
AccessViolationException	It is thrown when try to read or write protected memory.
AggregateException	Represents one or more errors that occur during application execution.
AppDomainUnloadedException	It is thrown when try to access an unloaded application domain.
ApplicationException	It is base class for application-defined exceptions.
ArgumentException	It is thrown when invalid argument provided to a method.
ArgumentNullException	It is thrown when a method requires argument but no argument is provided.
ArgumentOutOfRangeException	It is thrown when value of an argument is outside the allowable range.
ArithmeticException	It is thrown when doing arithmetic, casting, or conversion operation.
ArrayTypeMismatchException	It is thrown when try to store an element of the wrong type within an array.
BadImageFormatException	It is thrown when file image, dll or exe program is invalid.
CannotUnloadAppDomainException	It is thrown when try to unload an application domain fails.
ContextMarshalException	The exception that is thrown when an attempt to marshal an object across a context boundary fails.
DataMisalignedException	It is thrown thrown when a unit of data is read from or written to an address that is not a multiple of the data size.
DivideByZeroException	It is thrown when there is an attempt to divide an integral or decimal value by zero.
DllNotFoundException	It is thrown when a DLL specified in a DLL import cannot be found.
DuplicateWaitObjectException	The exception that is thrown when an object appears more than once in an array of synchronization objects.
EntryPointNotFoundException	The exception that is thrown when an attempt to load a class fails due to the absence of an entry method.
ExecutionEngineException	The exception that is thrown when there is an internal error in the execution engine of the common language runtime.
FieldAccessException	It is thrown when there is an invalid attempt to access a private or protected field inside a class.
FormatException	The exception that is thrown when the format of an argument is invalid, or when a composite format string is not well formed.
IndexOutOfRangeException	The exception that is thrown when an attempt is made to access an element of an array or collection with an index that is outside its bounds.
InsufficientMemoryException	The exception that is thrown when a check for sufficient available memory fails. This class cannot be inherited.
InvalidCastException	The exception that is thrown for invalid casting or explicit conversion.
InvalidOperationException	The exception that is thrown when a method call is invalid for the object's current state.
InvalidProgramException	The exception that is thrown when a program contains invalid Microsoft intermediate language (MSIL) or metadata.
InvalidTimeZoneException	The exception that is thrown when time zone information is invalid.
MemberAccessException	The exception that is thrown when an attempt to access a class member fails.
MethodAccessException	The exception that is thrown when there is an invalid attempt to access a method, such as accessing a private method from partially trusted code.
MissingFieldException	The exception that is thrown when there is an attempt to dynamically access a field that does not exist.
MissingMemberException	The exception that is thrown when there is an attempt to dynamically access a class member that does not exist.
MissingMethodException	The exception that is thrown when there is an attempt to dynamically access a method that does not exist.
MulticastNotSupportedException	The exception that is thrown when there is an attempt to combine two delegates based on the Delegate type instead of the MulticastDelegate type.
NotCancelableException	It is thrown when an attempt is made to cancel an operation that is not cancelable.
NotFiniteNumberException	The exception that is thrown when a floating-point value is positive infinity, negative infinity, or Not-a-Number (NaN).
NotImplementedException	The exception that is thrown when a requested method or operation is not implemented.
NotSupportedException	The exception that is thrown when an invoked method is not supported, or when there is an attempt to read, seek, or write to a stream that does not support the invoked functionality.
NullReferenceException	The exception that is thrown when there is an attempt to dereference a null object reference.
ObjectDisposedException	The exception that is thrown when an operation is performed on a disposed object.
OperationCanceledException	The exception that is thrown in a thread upon cancellation of an operation that the thread was executing.
OutOfMemoryException	The exception that is thrown when there is not enough memory to continue the execution of a program.
OverflowException	The exception that is thrown when an arithmetic, casting, or conversion operation in a checked context results in an overflow.
PlatformNotSupportedException	The exception that is thrown when a feature does not run on a particular platform.
RankException	The exception that is thrown when an array with the wrong number of dimensions is passed to a method.
StackOverflowException	The exception that is thrown when the execution stack overflows because it contains too many nested method calls.
SystemException	Serves as the base class for system exceptions namespace.
TimeoutException	The exception that is thrown when the time allotted for a process or operation has expired.
TimeZoneNotFoundException	The exception that is thrown when a time zone cannot be found.
TypeAccessException	The exception that is thrown when a method attempts to use a type that it does not have access to.
TypeInitializationException	The exception that is thrown as a wrapper around the exception thrown by the class initializer. This class cannot be inherited.
TypeLoadException	The exception that is thrown when type-loading failures occur.
TypeUnloadedException	The exception that is thrown when there is an attempt to access an unloaded class.
UnauthorizedAccessException	The exception that is thrown when the operating system denies access because of an I/O error or a specific type of security error.
UriFormatException	The exception that is thrown when an invalid Uniform Resource Identifier (URI) is detected.

System.Data Exception

Exception	Condition
ConstraintException	Represents the exception that is thrown when attempting an action that violates a constraint.
DataException	Represents the exception that is thrown when attempting an action that violates a constraint.
DBConcurrencyException	Gets or sets the value of the DataRow that generated the DBConcurrencyException.
DeleteRowInaccessibleException	Represents the exception that is thrown when an action is tried on a DataRow that has been deleted.
DuplicateNameException	Represents the exception that is thrown when a duplicate database object name is encountered during an add operation in a DataSet -related object.
EvaluateException	Represents the exception that is thrown when the Expression property of a DataColumn cannot be evaluated.
InRowChangingEventException	Represents the exception that is thrown when you call the EndEdit method within the RowChanging event.
InvalidConstraintException	Represents the exception that is thrown when incorrectly trying to create or access a relation.
InvalidExpressionException	Represents the exception that is thrown when you try to add a DataColumn that contains an invalid Expression to a DataColumnCollection.
MissingPrimaryKeyException	Represents the exception that is thrown when you try to access a row in a table that has no primary key.
NoNullAllowedException	Represents the exception that is thrown when you try to insert a null value into a column where AllowDBNull is set tofalse.
OperationAbortedException	This exception is thrown when an ongoing operation is aborted by the user.
ReadOnlyException	Represents the exception that is thrown when you try to change the value of a read-only column.
RowNotInTableException	Represents the exception that is thrown when you try to perform an operation on a DataRow that is not in a DataTable.
StrongTypingException	The exception that is thrown by a strongly typed DataSet when the user accesses a DBNull value.
SyntaxErrorException	Represents the exception that is thrown when the Expression property of a DataColumn contains a syntax error.
TypedDataSetGeneratorException	The exception that is thrown when a name conflict occurs while generating a strongly typed DataSet.
VersionNotFoundException	Represents the exception that is thrown when you try to return a version of a DataRow that has been deleted.

System.IO Exception

Exception	Condition
DirectoryNotFoundException	The exception that is thrown when part of a file or directory cannot be found.
DriveNotFoundException	The exception that is thrown when a drive that is referenced by an operation could not be found.
EndOfStreamException	An EndOfStreamException exception is thrown when there is an attempt to read past the end of a stream.
FileFormatException	The exception that is thrown when an input file or a data stream that is supposed to conform to a certain file format specification is malformed.
FileLoadException	The exception that is thrown when a managed assembly is found but cannot be loaded.
FileNotFoundException	The exception that is thrown when an attempt to access a file that does not exist on disk fails.
InternalBufferOverflowException	The exception thrown when the internal buffer overflows.
InvalidDataException	The exception that is thrown when a data stream is in an invalid format.
IOException	The exception that is thrown when an I/O error occurs.
PathTooLongException	The exception that is thrown when a path or file name is longer than the system-defined maximum length.
PipeException	Thrown when an error occurs within a named pipe.

Related Links

Exceptions and Exception Handling - C# | Microsoft Learn
C# Exceptions - GeeksforGeeks