All web forms are inherited from page class.
In the context of .NET web forms, all web forms are inherited from the System.Web.UI.Page class. This class serves as the base class for web forms in ASP.NET. When you create a new web form in a .NET application, it implicitly inherits from this class. The System.Web.UI.Page class provides essential functionality for handling web requests, managing the page lifecycle, and interacting with ASP.NET server controls.