Enterprise Library for .Net Framework 3.5 – EntLib v4.1 是patterns & practices 小组为.NET Framework 3.5 开发一套企业库，目前最新版本为v4.1，共包括9个Application Block，包括数据访问（Data Access Application Block）、异常管理（Exception Handling Application Block）、数据验证（Validation Application Block）等等，对企业应用开发非常有帮助，也非常实用。-Enterprise Library for. Net Framework 3.5- EntLib v4.1 is for the patterns &　practices group. NET Framework 3.5 to develop a corporate database, the latest version is v4.1, including a total of 9 Application Block, Data Access (Data Access Application Block), exception management (Exception Handling Application Block), data validation (Validation Application Block), etc., for enterprise application development is very helpful and very practical.