understanding IsPostBack Property

MSK Afridi

Hi there,

I am C# newbie.I need to use IsPostBack Property on my web site but I have understanding issues with it. now after exploring the web, I found that the ist page is loaded as get request but when I click again on the link of the same page so this will be a postback. so what I did is to put IsPostBack property on that page load event as follows

if (!IsPostBack)
{
Response.Wriet("page loaded for the first time");
}
esle
{
Response.Wriet("page is not loaded for the first time");
}

Now the above code when run for the first time so it is ok and work fine but when i click a link of the same page even again and again so I am getting the message" page loaded for the first time". what i thin that it should display the other message as the page is being posted back

please help in this regard what concept I am missing

Regards

4 Replies

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Jignesh Kumar6y ago
Hey,
IsPostback is readonly property which is normally usded on Page_load event to check if page is getting generated due to postback requested by a control of the page or if the page is getting loaded first time.

which ever code you want to load only once you can put under !Ispostback property and getting execute once only. i.e some of static values or master data generaly we need once only. like some drop down values we do not require to change we can bind under this condition
if(!IsPostBack)
{
BindMasterDropDownValues();

}

private void BindMasterDropDownValues()
{
//DropDown binding Code goes here
}
Rajanikant Hawaldar6y ago
I am good how about you. Yes your right, that's expected behavior in asp.net
MSK Afridi6y ago
Hi Rajanikant, how r you hope u r safe and at home.

This mean that when i click on home page link again and again so it is not post back but when i have button on a page to click to send data to server so that will be post back.
Please correct if i am wrong

reagards
Rajanikant Hawaldar6y ago
Yes you can , Postback in an event that is triggered when a action is performed by a contol on a asp.net page. for eg. when you click on a button the data on the page is posted back to the server for processing. Is Postback is normally used on page _load event to detect if the page is getting generated due to postback requested by a control on the page or if the page is getting loaded for the first time. When the page is loaded first time IsPostBack = false and when an event takes place it means IsPostBack=true