C# Exceptions - Key Properties of System.Exception
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The most important properties of System.Exception are the following:
StackTrace
A string representing all the methods that are called
from the origin of the exception to thecatchblock.
Message
A string with a description of the error.
InnerException
The inner exception (if any) that caused the outer
exception. This, itself, may have another
InnerException.
All exceptions in C# are runtime exceptions—there is no equivalent to Java’s compile-time checked exceptions.
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.
System.ArgumentException
Thrown when a function is called with a bogus argument. This generally indicates a program bug.
System.ArgumentNullException
Subclass ofArgumentExceptionthat’s thrown when a function argument is (unexpectedly)null.
System.ArgumentOutOfRangeException
Subclass ofArgumentExceptionthat’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 theAddmethod on a collection for whichIsReadOnlyreturnstrue.
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.
Please check back next week for the continuation of this series.
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 This article is excerpted from chapter four of C# 3.0 in a Nutshell, Third Edition, A Desktop Quick Reference, written by Joseph Albahari and Ben Albahari (O'Reilly; ISBN: 0596527578). Check it out today at your favorite bookstore. Buy this book now.
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