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What is .NET Framework?
.NET Framework is a complete environment that allows developers to develop, run, and deploy the following applications:
Console applications
Windows Forms applications
Windows Presentation Foundation (WPF) applications
Web applications (ASP.NET applications)
Web services
Windows services
Service-oriented applications using Windows Communication Foundation (WCF)
Workflow-enabled applications using Windows Workflow Foundation (WF)

What is ASP?
Active Server Pages(ASP), also known as Classic ASP, is a Microsoft’s server side technology, which helps in creating dynamic and user friendly Web pages.It uses different scripting languages to create dynamic Web pages, which can be run on any type of browser.

What is ASP.NET?
ASP.NET is a specification developed by Microsoft to create dynamic Web applications, Web sites, and Web services. It is a part of .NET Framework. You can create ASP.NET applications in most of the .NET compatible languages, such as Visual Basic, C#, and J#.

Difference between ASP and ASP.NET?
The basic difference between ASP and ASP.NET is that ASP is interpreted; whereas, ASP.NET is compiled. This implies that since ASP uses VBScript; therefore, when an ASP page is executed, it is interpreted.ASP has Mixed HTML and coding logic.Limited OOPS support.On the other hand, ASP.NET uses .NET languages, such as C# and VB.NET, which are compiled to Microsoft Intermediate Language (MSIL).Variety of compilers and tools available including the Visual studio.Net.

What are the types of validation controls in Asp.net ?
Required Field Validator
Range Validator
Compare Validator
Regular Expression Validator
Custom Validator
Validation Summary
What is a namespace?
A namespace is a method of organizing a group of assemblies, classes, or types. A namespace acts as a container—like a disk folder—for classes organized into groups usually based on functionality. C# namespace syntax allows namespaces to be nested.