ASP.NET is a Web application framework developed and marketed by Microsoft to allow programmers to build dynamic Web sites, Web applications and Web services. ASP.NET is built on the Common Language Runtime (CLR), allowing programmers to write ASP.NET code using any supported .NET language.
ASP.NET Web pages, known officially as Web Forms are the main building block for application development. Web forms are contained in files with an ".aspx" extension; these files typically contain HTML markup, as well as markup defining server-side Web Controls and User Controls. With ASP.NET Framework 2.0, Microsoft introduced a new code-behind model which allows static text to remain on the .aspx page, while dynamic code remains in an .aspx.vb or .aspx.cs or .aspx.fs file (depending on the programming language used).
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