Common Exception Type

Common Exception Types

The following exception types are used widely throughout the CLR and .NET Framework. You can throw these yourself or use them as base classes for deriving custom exception types.

Class	Description
System.ArgumentException	Thrown when a function is called with a bogus argument. This generally indicates a program bug.
System.ArgumentNullException	Subclass of ArgumentException that’s thrown when a function argument is (unexpectedly) null.
System.ArgumentOutOfRangeException	Subclass of ArgumentException that’s thrown when a (usually numeric) argument is too big or too small. For example, this is thrown when passing a negative number into a function that accepts only positive values.
System.InvalidOperationException	Thrown when the state of an object is unsuitable for a method to successfully execute, regardless of any particular argument values. Examples include reading an unopened file or getting the next element from an enumerator where the underlying list has been modified partway through the iteration.
System.NotSupportedException	Thrown to indicate that a particular functionality is not supported. A good example is calling the Add method on a collection for which IsReadOnly returns true.
System.NotImplementedException	Thrown to indicate that a function has not yet been implemented.
System.ObjectDisposedException	Thrown when the object upon which the function is called has been disposed.
System.NullReferenceException	Thrown when attempting to access a member of an object whose value is null (indicating a bug in your code).

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