Please explain this function and were to this use?

Hi,

 

 

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.

 

 

http://forums.asp.net/t/1115866.aspx?What+is+IsPostBack 

That is used in the OnLoad of an aspx page. It indicates whether the page is first loaded (IsPostBack == false) or the page was posted to itself (IsPostBack == true).

 

Read more here:

https://msdn.microsoft.com/en-us/library/system.web.ui.page.ispostback(v=vs.110).aspx