Writing robust enterprise applications presents special challenges for developers, but Microsoft has addressed that challenge with, for free download Enterprise Library for NET Framework .. Enterprise Library is a collection of application blocks and guidance documents that together provide functionality common to enterprise applications, each application block includes full source code. Fenster covers all seven application blocks as implemented for the NET Framework. 1.1, shows how to develop and use new application block, and explains how Enterprise Library changed to NET Framework. 2.0. Readers will learn How Configuration Application Block is designed and can be used at runtime to easily read and write configuration dataHow Configuration Application Block works at design time for all blocksHow using Data Access Block to create portable data layerHow using the Exception Handling Application Block to implement, policy-driven systemHow application-wide exception handling to use the Logging and Instrumentation Application Block to log and instrument messages independent of destinationHow to add authentication, authorization, role membership, security cache message, and profile membership features to an application with Application Security BlockHow to use the Cryptography Application Block to add functionality to encrypt and decrypt data and create and compare hashesHow to build their own applications and providers block it? snap?