PostBack is an event that is triggered when an action is performed by an ASP.Net Control. For example when we click on an asp button, the data on the page is posted back to the server for processing. PostBack is the name given to the process of submitting an ASP.NET page to the server for processing.
IsPostBack-This property is automatically set to False whenever a page is called for first time and whenever a server redirect a new instance of a page this property is set to True.
Samuel Fernandes
13-Aug-2017I am grateful to you, for sharing a post like this.