---
title: "Using the Callback"
description: "The Callback feature that enables you to retrieve page values and populates them to an already generated page without regenerating the page. This cap"
author: "Uttam Misra"
published: 2010-10-09
updated: 2020-03-04
canonical: https://www.mindstick.com/articles/152/using-the-callback
category: "asp.net"
tags: ["asp.net"]
reading_time: 1 minute
---
# Using the Callback
The [Callback](https://www.mindstick.com/forum/34086/jquery-callback-functions) [feature](https://www.mindstick.com/forum/541/what-is-new-feature-in-sql-server-2012) that enables you to [retrieve](https://www.mindstick.com/forum/34400/how-to-retrieve-form-values-in-controller-action) page [values](https://www.mindstick.com/forum/159360/how-to-write-sql-query-to-join-comma-separated-values) and populates them to an [already](https://yourviews.mindstick.com/view/88453/the-hidden-ways-ai-is-already-controlling-your-daily-life) generated page without regenerating the page. This capability makes it possible to change values on a page without going through the entire [postback](https://www.mindstick.com/blog/490/postback-in-asp-dot-net) cycle.\
##### It uses the following method:
- Page.ClientScript.GetCallbackEventReference()
- Page.ClientScript.RegisterClientScriptBlock()
- GetCallbackResult()
- RaiseCallbackEvent()
And it inherites class is **System.Web.UI.ICallbackEventHandler**
How we implement the Callback
##### Example:
**Step1:** we use the following code on [aspx page](https://www.mindstick.com/forum/218/how-do-i-create-an-aspx-page-that-periodically-refreshes-itself)
```
Callback
```
**Step2:** We write the following code on [aspx.cs](https://www.mindstick.com/forum/172/how-v-insert-data-into-table-and-display-into-gridview-in-aspx-cs-file-with-out-using-wizard) page.
```
public partial class y : System.Web.UI.Page,System.Web.UI.ICallbackEventHandler { private string aa = null; protected void Page_Load(object sender, EventArgs e) { string cref = Page.ClientScript.GetCallbackEventReference(this, "arg", "amit", "context"); string cscript = "function UseCallback(arg,context)" + "{" + cref + ";" + "}"; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallback", cscript, true); } public string GetCallbackResult() { return aa; } public void RaiseCallbackEvent(string eventArgument) { aa = eventArgument; }}
```
**Step3:** Run the [project](https://yourviews.mindstick.com/story/1788/things-to-ensure-your-construction-project-is-successful)
**[Output](https://www.mindstick.com/interview/34427/explain-the-output-in-angular):**
---
Original Source: https://www.mindstick.com/articles/152/using-the-callback
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