I am writing a simple ASP.NET Web Forms application. I want to improve the code by implementing any design pattern with which abstraction is achieved and increases manageability and understandability.Which pattern is recommended? Please also provide links to sample applications.
Which pattern to use with a typical Web Form?
design patterns;asp.net
You might consider using the Model-View-View model MVVM pattern.  It is a derivative of MVC, but is designed / intended to be used in exactly the situation you describe.  There is a wealth of information on the MSDN site if you don't feel like googling it.MVVM facilitates a clear separation of the development of the graphical user interface (either as markup language or GUI code) from the development of the business logic or back end logic known as the model (also known as the data model to distinguish it from the view model). The view model of MVVM is a value converter[4] meaning that the view model is responsible for exposing the data objects from the model in such a way that those objects are easily managed and consumed. In this respect, the view model is more model than view, and handles most if not all of the views display logic (though the demarcation between what functions are handled by which layer is a subject of ongoing discussion[5] and exploration). The view model may also implement a mediator pattern organising access to the backend logic around the set of use cases supported by the view.