c# - Post back issue -

OK Let me ask questions like this: Generally, there is no page cycle:

page_load < / P>

Submit On-Click and / or Handler

Page_load.

If so, the values ​​of control on page should be during onclick / submit handler? Value by users, or value from page_load?

page load event before control events So if you are in the page load event If the values ​​change, these changes will overwrite any values ​​the user chooses, and in the control incidents, you will see the values ​​set in the page load.

If you start something in the page load event but only when it first comes to the page, you can use IsPostBack:

  if (! IsPostBack ) {// Getting Started Which You Just Want  

Here is a good one with many more details.

Here is a simple example sequence: <

The fire of the page load

The page is render and sent to the browser

On the user Some works on the page (clicks on a button, a text box changes, which is set to AutoCostback, etc.)

A post on the browser page

Page loads The fire (again) this time IsPostBack is true. Also keep in mind, this is not the same "page" object because it was in # 2 because every HTTP request The new page object Ri way. For example, member variables will not be saved on all requests.

The appropriate control events fire (clicks, text changes, etc.)

The page is render and is sent back to the browser