what is postback in asp.net

Arvind Yadav

14y16.8k.NET

I am new in asp.net. what is the postback in asp.net. what is the use of this postback in asp.net. pls give me 1 example of this, how this property works in asp.net.

6 Replies

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Guruparan Giritharan14y ago
Dear ARVIND YADAV
Post back is submitting the form to the Server or posting back the same page.
There is a boolean variable named IsPostback which can be used to check this if the page loads for the first time the value of this variable is false
the page load is second or above its true

this is mainly useful when you want to setup some value for the controls.
because you may need to change the values in the second load or above.

Regards

Guruparan.
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Krishna Garad14y ago
Postback refers t o submitting the form to itself. Postback can be self-postback, crosspage-postback. When we are submitting form to same form then it is self postback. Whnever we are submitting form to another form for eg. using response.redirect("somepage.aspx?_querystring=somevalue"); i.e. cross-page-postback.
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Anuja Pawar14y ago
Hi Arvind,

In the context of web development, a postback is an HTTP POST to the same page that the form is on. In other words, the contents of the form are POSTed back to the same URL as the form.

In ASP, a form and its POST action have to be created as two separate pages, resulting in the need for an intermediate page and a redirect if one simply wants to perform a postback. This problem was addressed in ASP.NET with the __doPostBack() function and an application model that allows a page to perform validation and processing on its own form data.

Postbacks are commonly seen in edit forms, where the user updates information in a form, hits save or submit, and the page is refreshed with a new form populated with the recently updated information.

For how a post back works, read this
http://www.xefteri.com/articles/show.cfm?id=18
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Ravishankar Singh14y ago
PostBack is the name given to the process of submitting an ASP.NET page to the server for processing . PostBack is done if certain credentials of the page are to be checked against a database (such as verification of username and password). This is something that a client machine is not able to accomplish and thus these details have to be 'posted back' to the server.
A simple example to illustrate the usage of PostBack is a login page. After the user has typed his username and password, he clicks on the 'Login' button. Upon the click, the page is sent to the server to check against the database/XML file to check if the user with supplied details is an authenticated user.
for examples:
http://asp-net-example.blogspot.com/2009/01/aspnet-cross-page-postback-example-how.html
http://www.codeproject.com/KB/aspnet/ClientObjectPostBack.aspx
http://www.dotnetcurry.com/ShowArticle.aspx?ID=203
http://www.xefteri.com/articles/show.cfm?id=18
http://msdn.microsoft.com/en-us/library/ms178208.aspx
http://weblogs.asp.net/mnolton/archive/2003/06/04/8260.aspx
http://forums.asp.net/t/1153318.aspx/1?Javascript+detect+Page+IsValid+and+IsPostBack

Hope this will help you understand and give you start..

Cheers :)
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Satyapriya Nayak14y ago
Hi Arvind,

PostBack is the name given to the process of submitting an ASP.NET page to the server for processing . PostBack is done if certain credentials of the page are to be checked against a database (such as verification of username and password). This is something that a client machine is not able to accomplish and thus these details have to be 'posted back' to the server.

Please refer the below link and Our recommended articles

http://dotnet.tekyt.info/?p=30

http://www.c-sharpcorner.com/uploadfile/2f73dd/what-is-postback-in-Asp-Net/default.aspx

Thanks
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Priya Linge14y ago
Hi,

1.PostBack is the name given to the process of submitting an ASP.NET page to the server for processing .
2.PostBack is done if certain credentials of the page are to be checked against a database (such as verification of username and password).
3.This is something that a client machine is not able to accomplish and thus these details have to be 'posted back' to the server.
4.Example :
The usage of PostBack is a login page :
Explanation:
After the user has typed his username and password, he clicks on the 'Login' button. Upon the click, the page is sent to the server to check against the database/XML file to check if the user with supplied details
is an authenticated user.
Please check below link for more information regarding Postback in ASP.NET.
http://dotnet.tekyt.info/?p=30
http://www.codersource.net/asp-net/asp-net-articles/working-with-post-back-in-asp-net.aspx
Hope this will help you.
Thanks.
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