Difference of postback and pageload

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. MSDN describes the page life cycle very clearly in the following link. Please go through it.

http://msdn.microsoft.com/en-us/library/ms178472.aspx[^]

Some other references:

http://www.shoutasp.net/discussions/p344/What-methods-are-fired-during-the-page-load-in-ASP-Net.aspx[^]

http://www.c-sharpcorner.com/uploadfile/2f73dd/what-is-postback-in-Asp-Net/[^]

http://www.evagoras.com/2011/02/10/how-postback-works-in-asp-net/[^]

Regards,
Vani

hi,

Both PageLoad and PostBack are page life cycle event..

The PageLoad event occurs first and then PostBack.

Post back is a part of page load which can happen only when the page is loaded..


in other words if there is no page load then it means no html elements like buttons
are loaded and since no buttons are loaded so no click event and so no postback can happen.


for eg:

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack) //means no postback..page loaded first time
{
//this loop will happen only when the page is loaded for first time..
//here u can put the code or function which you want only once to run
FunctionPageFirstLoad();
}

if (Page.IsPostBack) //its a postback..page has already beenloaded once
{
//this loop will happen only when the page has loaded and then there
//is a click event, may be from button click,
FunctionPageEventClickLoad();
}
}

private void FunctionPageFirstLoad()
{
//this function will be call only once when the page is loaded for the first time.
}
private void FunctionPageEventClickLoad()
{
//this function will be called every time when there is a click event from any button or other element.
}

according to my side every time when page load occur then post-back value always true
then if you want something is happen in page load and it will not occur after page load then we put these thing on if(!ispostback)