Problems with screen value passing in ASP.NET

roxettechbin

I have a picture 1.aspx with a textbox and button inside
I add the following event to the button event:
Protected Sub Button1_Click (ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = "aaaa"
End Sub
Then submit this picture to the next picture
<asp: Button ID = "Button1" runat = "server" Text = "Button" PostBackUrl = "~ / 2.aspx" />
Why can't I get the value of the previous screen with request.form ("textbox1") in the next screen (2.aspx)?
I enter the value in the text box in 1.aspx, and I can get the value in the next screen. But why can't I pay for the textbox in the click event and then the next screen can't be received?

xinyu5460

Because you define PostBackUrl = "~ / 2.aspx", the page will not trigger your click event at all, which means that TextBox1.Text will never be assigned a value before submitting to 2.aspx, so in 2.aspx It is impossible to get

saintfrosty

How do you get and assign? You set breakpoints for debugging in both places to see if the click event is executed, and which interrupt is executed first, and which one is executed after?

saintfrosty

Because you define PostBackUrl = "~ / 2.aspx", the page will not trigger your click event at all
——————————————————————————————————————
Clicking on the PreviousPage fires the click event.

roxettechbin

So what should I do? My screen must jump to 2.aspx, and the textbox in 1.aspx must be used after the button is clicked.
What should I do to solve it?

saintfrosty

Write in 2.aspx:

Page1 prev = (Page1) this.PreviousPage;
if (prev == null)
  throw new Exception ("1.aspx was not executed.");

TextBox txtboxOnPage1 = Page1.TextBox1;

And Text of txtboxOnPage1 can get the value after click.

saintfrosty

Page1 prev = (Page1) this.PreviousPage;
if (prev == null)
  throw new Exception ("1.aspx was not executed.");

TextBox txtboxOnPage1 = prev.TextBox1;


Among them, Page1 is the type defined in your 1.aspx code behind code.

roxettechbin

And VB syntax? I didn't understand the above
Thank you

sabs_nn

default.aspx

    Protected Sub Button1_Click (ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = "hello wyp"
    End Sub

Result.aspx
 Protected Sub Page_Load (ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim prvPage As Page = Page.PreviousPage
        Response.Write (CType (prvPage.FindControl ("textbox1"), TextBox) .Text)
    End Sub

roxettechbin

OK thanks