In this chapter, we have learned about the fundamental elements of the Data Access Application Block such as Database, SqlDatabase, OracleDatabase, SqlCeDatabase, GenericDatabase, Parameter Mapper, Output Mappers, and so on. We have learned about the required assemblies and configuration. We have also explored various ways of data retrieval, adding of input and output parameters, mapping of parameters and rows, and learned to leverage DbTransaction. In the next chapter, we will explore, understand, and leverage the Logging block to write messages.