Demo of update panel in asp.net

Look here for more infos on ASP. So place it above your dropdownlist control. You also need to set the AutoPostBack property to true on the dropdownlist for the selectedindexchange event to fire on it.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Update Panel not updating content Ask Question. Asked 10 years, 1 month ago. Active 10 years, 1 month ago. Viewed 23k times. EventArgs Handles Me. SelectedIndexChanged Label1. SelectedIndex UpdatePanel1.

Improve this question. Add a comment. Active Oldest Votes. Set the autopostback to true in the drop down. Now I am going to show you how to check the availability of user name in database let's follow the following steps:. Now go the solution explorer on to the right side of the application and do the following steps figure given below. Debug the application by press F5 to execute Web form.

After debugging the application then the output would be as shown below. In this article you saw by using two Microsoft Ajax server controls the ScriptManager Control and the UpdatePanel Control we can refresh only required part of the page instead of whole page. View All. Pankaj Lohani Updated date Dec 07, Introduction This article describes how to add partial page update support to a web page by using two Microsoft Ajax server controls the ScriptManager Control and the UpdatePanel Control.

By Priya Pedamkar. In the case of current software industry, it is very common expecting from every client, that every time data changes should not be required of page refresh, that means page will be populate suddenly by kind of some internal server-side call, but from the client view it will never come as refreshing the page.

NET update panel is one of the popular control which manages to update only the part of the page not the entire page by using Ajax call, normally ASP. NET has two kinds of ajax controllers, script manager and update panel, update panel is mainly one of the popular one. NET script manager controller or update panel controller both mainly ensuring to do some ajax call in client-side and update panel is one of the key features for ensuring part of the page reloading without page refresh.

NET mainly ensuring to maintain client-side code for Ajax definition, where needs to provide exact URL for executing the same, after that update panel basically communication with back end server-side code, execute the logic, pick up the require or corresponding data and display on the screen without page refreshing.

End-user unable to understand something refreshing or rendering happening in the screen, as page refresh is not there. But the developer needs to ensure on that specific time no actionable button should work, those are required to disable for the user used, as data populating logic already defined in the ajax call. One of the very common example where part of the page getting a refresh with page refreshing. The triggering point should be the one button click in the below example. Add require items for designing the required pages for ASP.

NET web application in the defined template. Choose corresponding ASPX file and moving to the design tab of that specific file for designing the page.