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MongoDB Atlas runs apps anywhere
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
Provide standard calls for vendor specific functionality through ADO.NET. Additional functionality includes: enumerate databases, tables, views, columns, stored procedures, parameters; get an autogenerated primary key; and more. Also some non ADO
ARD Toolkit - class library for typical tasks: thread pool and synchronization, vendor independent db access, typed XML configuration and custom object instantiation, logging, cryptography, smart client, cross-machine process synchronization, etc.
Loosely coupled, extensible database access library written in C#. Allows direct database access over a relational vendor-independent data layer as well as automated persistence through O/R mapping containers that work upon the data layer themselves.