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The internal access modifier is not limited to type declarations It is also available on type members Therefore, you can designate a type as public but mark specific methods within the type as internal so that the members are available only from within the assembly It is not possible for the members to have a greater accessibility than the type If the class is declared as internal , then public members on the type will be accessible only from within the assembly

public DatabaseException( string message, Exception innerException) { InnerException = innerException; // } }

protected internal is another type member access modifier Members with an accessibility modifier of protecte internal will be accessible from all locations within the containing assembly and from classes that derive from

This custom exception might be created to wrap proprietary database exceptions Since Oracle and SQL Server (for example) each throw different exceptions for similar errors, an application could define a custom exception that standardizes the database-specific exceptions into a common exception wrapper that the application can handle in a standard manner That way, whether the application was using an Oracle or a SQL Server backend database, the same catch block could be used to handle the error higher up the stack The only requirement for a custom exception is that it derives from SystemException or one of its descendents However, there are several more good practices for custom exceptions

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parameters, a string parameter, and a parameter set of a string and an inner exception Furthermore, since exceptions are usually constructed within the same statement in which they are thrown, any additional exception data should also be allowed as part of the constructor (The obvious exception to creating all these constructors is if certain data is required and a constructor circumvents the requirements)

Description Declares that the member is accessible up to whatever level the type is accessible If the class is internal , the member will be internal Public members will be accessible from outside the assembly if the containing type is public Accessible from within the assembly only Accessible from within the containing type, but inaccessible otherwise

than approximately five levels) The inner exception serves an important purpose when rethrowing an exception that is different from the one that was caught For example, if a SystemDataSqlClientSqlException is thrown by a database call but is caught within the data access layer to be rethrown as a DatabaseException, then the DatabaseException constructor that takes the SqlException

Declares the member as accessible within the containing type and any subtypes derived from it, regardless of assembly Accessible from anywhere within the containing assembly and from any types derived from the containing type, even if the derived types are within a different assembly

(or inner exception) will save the original SqlException in the InnerException property That way, when requiring additional details about the original exception, developers can retrieve the exception from the InnerException property (for example, exceptionInnerException)

ADVANCED TOPIC Serializable Exceptions Serializable objects are objects that the runtime can persist into a stream a file stream, for example and then reinstantiate out of the stream In the case of exceptions, this may be necessary for certain distributed communication technologies To support serialization, exception declarations should include the SystemSerializableAttribute attribute or they should implement ISerializable Furthermore, they must include a constructor that takes SystemRuntimeSerializationSerializationInfo and SystemRuntimeSerializationStreamingContext Listing 105 shows an example of using SystemSerializableAttribute

To access code within a different assembly, the C# compiler allows the developer to reference the assembly on the command line The option is / reference (/r is the abbreviation), followed by the list of references The Program class listing from Listing 98 uses the Coordinate class, and if you place this into a separate executable, you reference Coordinatesdll using the NET command line shown in Output 95

// Supporting serialization via an attribute [Serializable] class DatabaseException : SystemApplicationException { // // Used for deserialization of exceptions public DatabaseException( SerializationInfo serializationInfo, StreamingContext context) { // } }

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As mentioned in 2, all data types are identified by the combination of their namespace and their name For the classes you defined earlier, there was no explicit namespace declaration Classes such as these are automatically declared as members of the default global namespace It is highly likely that such classes will experience a name collision, which occurs when you attempt to define two classes with the same name Once you begin referencing other assemblies from third parties, the likelihood of a name collision increases even further To resolve this, you should place classes into namespaces For example, classes outside of the System namespace are generally placed into a namespace corresponding with the company, product name, or both Classes from Addison-Wesley, for example, are placed into an Awl or AddisonWesley namespace, and classes from Microsoft (not System classes) are located in the Microsoft namespace You should use the namespace keyword to create a namespace and to assign a class to it, as shown in Listing 913

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