.ASPX File Extension
Active Server Page Extended File
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What is an ASPX file?
An ASPX file is an Active Server Page Extended (ASPX) file, a webpage generated by web servers running the Microsoft ASP.NET framework. It contains one or more scripts written in VBScript or C# code that the web server processes into HTML, which is sent to the user's web browser. ASPX files are often written with Microsoft Visual Web Developer and designed for the Microsoft ASP.NET framework.
ASPX pages are also called ".NET Web forms." You can identify these pages in a web browser by the URL in the address field, which ends in .aspx.
NOTE: ASP.NET was developed by Microsoft and released in 2002 to succeed Active Server Pages (ASP). It is a web application framework utilized by web developers to produce dynamic websites and applications.
Common ASPX Filenames
Default.aspx - The default webpage loaded when a client browser requests a web server directory on a Microsoft IIS-based server that uses ASP.NET. For example, when a client requests http://www.sampledomain.com/, the server loads http://www.sampledomain.com/Default.aspx, unless it is configured to load a different file.