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What is the meaning of "Provider" in ASP.NET Provider? For example when we are speaking about AuthorizationRuleProvider, connectionStrings.providerName, ...?
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And if you want to implement the Provider pattern in your application, take a look at this .NET Provider Model Template for Visual Studio (shameless plug).
It's a design pattern: The Provider model. There is some good information in this SO Q&A as well: Designing loosely coupled components in .NET - Provider Pattern
It's just a concrete implementation of an abstract interface. You can select an appropriate provider to fulfill the requirements of the interface at runtime.