Define and Describe the differences between IsPostBack, AutoPostBack, CrossPostBack

Question

User2061024676 posted

Define and Describe the differences between IsPostBack, AutoPostBack, CrossPostBack??? Please provied with illustrated examples.

Answer 1

User-1360095595 posted
You should be able to find all this information with a simple google/bing search. This homework is not very hard.

Answer 2

User210672981 posted

IsPostBack:http://msdn.microsoft.com/en-us/library/system.web.ui.page.ispostback.aspx

AutoPostBack:http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.autopostback.aspx

CrossPostBack:http://www.c-sharpcorner.com/UploadFile/DipalChoksi/xpgpostbk_asp2_dc08102006235543PM/xpgpostbk_asp2_dc.aspx

Hope helpful.

 

 

Answer 3

User960609757 posted

postback
A postback is initiated by the browser, and reloads the whole page, usually when a control on the page (e.g. a button) is changed.

example : http://www.java2s.com/Code/ASP/Page/PageIsPostBackDemoC.htm

AutoPostback
With some controls (e.g. dropdownlist,Checkboxes), you choose if changing the control should result in a postback. This property is called AutoPostback.

Controls that support AutoPostback includes:

    List item
    ListControl
    BulletedList
    CheckBoxList
    DropDownList
    ListBox
    RadioButtonList
    CheckBox
    TextBox

example : http://asp-net-example.blogspot.com/2009/03/how-to-use-dropdownlist-autopostback.html


Cross Page PostBack
A web form to post-back to a different web form (other than itself)

How to post to a different page

To set a web form to post back to a different web form, in the source web form, set the PostBackURL property of a control that implements IButtonControl (eg. Button, ImageButton, LinkButton) to the target web form. When the user clicks on this button control, the web form is cross-posted to the target web form. No other settings or code is required in the source web form.

example : http://www.c-sharpcorner.com/UploadFile/DipalChoksi/xpgpostbk_asp2_dc08102006235543PM/xpgpostbk_asp2_dc.aspx


callback
A callback is initiated by java script in the page, and can load/update parts of the page

A method which is invoked when a certain event occurs such as clicking on a button. It also could have another meaning that a page performs a request back to the server (such as an AJAX request).

example : http://msdn.microsoft.com/en-us/library/ms178210.aspx