An Event Handler is a subroutine that executes code for a given event.
Look at the following code:
When will the code above be executed? The answer is: "You don't know..."
The Page_Load event is one of many events that ASP.NET understands. The Page_Load event is
triggered when a page loads, and ASP.NET will automatically call the subroutine Page_Load, and
execute the code inside it:
Note: The Page_Load event contains no object references or event arguments
The Page_Load subroutine runs EVERY time the page is loaded. If you want to execute the code in
the Page_Load subroutine only the FIRST time the page is loaded, you can use the Page.IsPostBack
property. If the Page.IsPostBack property is false, the page is loaded for the first time, if it
is true, the page is posted back to the server (i.e. from a button click on a form):
The example above will write the "The date and time is...." message only the first time
the page is loaded. When a user clicks on the Submit button, the submit subroutine will write
"Hai Everyone!" to the second label, but the date and time in the first label will not
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