Problems caused by the execution of Page_Load

187191875

Private Sub Page_Load (ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Place the user code of the initialization page here
        TextBox1.Text = Today.Year.ToString.Trim
 End Sub

The page is initialized, giving TextBox1 an initial value, but the text content of TextBox1 can be changed. The current situation is quite the same. After changing it, click the execute button. The value of TextBox1 is the value given to Page_Load.
The question I want to ask is, when will the Page_Load process be executed?

ymooner

ymooner

If Not Page.IsPostBack The
TextBox1.Text = Today.Year.ToString.Trim
End If

pocketpc

The method upstairs seems to be asp.net.

187191875

Page.IsPostBack property
    Page.IsPostBack is used to check whether the current webpage is loaded for the first time. When the user browses this webpage for the first time, Page.IsPostBack will return False, not True for the first time this webpage is browsed; so when we You can use this property in the Page_Load event to avoid doing some repetitive actions.

187191875

It's easy to use. It seems that I have seen this instruction before reading and studying, but I don't know when I use it, stupid! Dishes! Thank youymoonerHa.
But there is still no explanation for the execution time of the Page_load process.

nick8023

Page_Load will be executed every time the page is submitted or refreshed, that is, it will be executed when you display the page load, if you have a button on the page, after clicking, Page_Load will be executed first, and then the button Events, as for how you want to execute the code in Page_Load, use the IsPostBack property to control.