---
title: "PostBack in ASP.Net"  
description: "In this blog I am going to trying to explain the concept of PostBack.  PostBack is the name given to the process of submitting an ASP.NET page to the"  
author: "Sumit Kesarwani"  
published: 2013-05-07  
updated: 2014-09-18  
canonical: https://www.mindstick.com/blog/490/postback-in-asp-dot-net  
category: "asp.net"  
tags: ["asp.net"]  
reading_time: 1 minute  

---

# PostBack in ASP.Net

In this blog I am going to trying to [explain the concept](https://www.mindstick.com/forum/159605/explain-the-concept-of-unique-key-violation-error) of PostBack.\

PostBack is the name given to the process of submitting an ASP.NET page to the server for processing. PostBack is [done if](https://answers.mindstick.com/qa/46918/what-can-be-done-if-i-forget-the-password-of-my-cleartrip-account) certain credentials of the page are to be checked against some sources (such as [verification](https://www.mindstick.com/forum/34736/what-is-difference-between-validation-and-verification) of [username and password](https://www.mindstick.com/forum/160407/how-does-a-bearer-token-differ-from-other-authentication-methods-such-as-username-and-password) using [database](https://www.mindstick.com/articles/12226/use-of-database-in-sencha-extjs-and-insert-record-from-user-form-using-ajax)). This is something that a client machine is not able to accomplish and thus these details have to be 'posted back' to the server.

\
IsPostBack

This [property](https://www.mindstick.com/blog/205/property-notification-in-c-sharp) is automatically set to False whenever a page is called for first time and whenever a server redirect a new [instance](https://www.mindstick.com/forum/1739/object-reference-is-not-set-to-an-instance-of-an-object-error-in-my-code) of a page this property is set to True.

[AutoPostBack](https://www.mindstick.com/interview/2074/what-is-autopostback)

This property is by default set to False. So if we perform some action on control such as [DropDownList](https://www.mindstick.com/articles/324837/how-to-bind-dropdownlist-in-mvc-core-from-database-using-entity-framework), no events are performed because events are not recognized.

---

Original Source: https://www.mindstick.com/blog/490/postback-in-asp-dot-net

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