ASP.NET Forms Authentication

ASP.NET has two authentication models.

One of the key improvements granted by the ASP.NET integration in IIS 7.0 is a unified authentication model. Instead of the two-stage model in previous versions of IIS, where IIS executed its own authentication methods before ASP.NET processing began, in Integrated mode IIS and ASP.NET authentication modules participate in a single authentication process as equals. With this, it becomes very easy to write custom authentication methods using .NET (that previously required ISAPI filters and C++ code), and use these solutions in a way that integrates seamlessly into the IIS security model.