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Active Directory Membership Provider
ASP.NET 2.0 allows you to validate users via Active Directory, database, or even a custom algorithm. - .NET
Medium Trust in ASP.NET Applications
Setting the trust level to "Medium" for an ASP.NET application can often be the perfect blend of security and functionality.
IIS Kernel Caching
Paraphrasing the Rutles, all you need is cache to speed up ASP.NET page requests. Enabling caching in IIS 6.0 is simple, but there are some limitations on which page requests can be cached.
Synchronizing Access to the ASP.NET Cache
A synchronizer is an intermediate but global object that you lock before entering in a piece of code sensitive to concurrency. Here are some tips on how to set up the lock. - .NET
Generics in ASP.NET
Generics can be used in ASP.NET to write neater and more strongly typed code, but ASP.NET 2.0 was not designed with generics in mind. Dino explains why.
An Overview of Generics
In the .NET Framework 2.0, C# and Visual Basic .NET support generics. This means that you can have a List of Integer and a List of ProductInfo, and they will be different types.
An Overview of Ajax.NET
Ajax.NET is an open-source ASP.NET library that greatly simplifies coding remote scripting.
ASP.NET Impersonation
With ASP.NET 1.1, it's possible to impersonate a fixed identity in Windows XP and Windows Server 2003, as well as under Windows 2000 machines and IIS 5.0.
ASP.NET2theMax
Because 2.0 complies with W3C Standards, ASP.NET coders will now have to avoid some commonly used tags and attributes. Not ready to upgrade? ASP.NET 2.0 will let you hit the compliance "snooze alarm" in your web.config file, but that option should be used cautiously.
ASP.NET2theMax
Each version of Windows has created new issues for using ASP.NET Impersonation. Windows XP and Windows Server 2003 provide new impersonation features that were trouble in Windows 2000 with IIS 5.0.