The list below shows a few of the new features introduced in ASP.Net 4.0 -

  1. Optional and Named Parameters
  2. COM Interoperability Enhancements
  3. Covariance and Contra-variance
  4. Dynamic Type Introduction

Web.config File Re-factoring means most of the elements of web.config file moved to machine.config. So we get more cleaner and easy to maintain web.config. The newly created web.config is almost empty with only .net target framework information in System.web.

If we set session Mode=”off” in web.config file, session will be disabled in the application. For this we need to configure web.config in the following way:




When client side validation is enabled server emit’s JavaScript code for the custom validators. However, note that does not mean that server side checks on custom validators do not execute. It does this redundant check two times, as some of the validators do not support client side scripting.

Yes, a single .NET DLL may contain any number of classes within it.

(IL)Intermediate Language is also known as MSIL (Microsoft Intermediate Language) or CIL (Common Intermediate Language). All .NET source code is compiled to IL. This IL is then converted to machine code at the point where the software is installed, or at run-time by a Just-In- Time (JIT) compiler.

CCW is a wrapper created by the common language runtime(CLR) that enables COM components to access .NET objects.
RCW is a wrapper created by the common language runtime(CLR) to enable .NET components to call COM components.
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