Sometimes it’s useful to throw exceptions from your code, for example if an incoming method argument is incorrect for some reason. Throwing Exception isn’t very specific so what should we throw and when? Here’s a quick
aide-mémoire for a few exception types I use:
| Exception type | When to use it |
| ArgumentException | The exception that is thrown when one of the arguments provided to a method is not valid. |
| InvalidOperationException | The exception that is thrown when a method call is invalid for the object's current state. |
| FormatException | The exception that is thrown when the format of an argument does not meet the parameter specifications of the invoked method. |
| NotImplementedException | The exception that is thrown when a requested method or operation is not implemented. |
References
http://msdn.microsoft.com/en-us/library/system.systemexception.aspx