Board index » Visual Studio » Simplest possible question?

Simplest possible question?

Visual Studio130
Ok, what's wrong with this picture? I have a simple webform with a single

textbox webcontrol and a single webcontrol button. When the form is

displayed, I manually type some new text into the textbox. Why aren't my

updates detected in the button's code?!



[It makes no difference how I set AutoPostBack or EnableViewState]



Thanks, Paul.

-------

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here



TextBox1.Text = "Init value goes in here"



End Sub



Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles Button1.Click



TextBox2.Text = TextBox1.Text '<<This always detects ""Init value goes in

here" even if I've edited it on-screen!!



End Sub


-
 

Re:Simplest possible question?

Change Page_Load to this:



Private Sub Page_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here



If Not Page.IsPostBack Then

TextBox1.Text = "Init value goes in here"

End If



End Sub



A simple question, gets a simple answer. :)



Greg





"qqq" <qqq@qqq.com>wrote in message

Quote
Ok, what's wrong with this picture? I have a simple webform with a single

textbox webcontrol and a single webcontrol button. When the form is

displayed, I manually type some new text into the textbox. Why aren't my

updates detected in the button's code?!



[It makes no difference how I set AutoPostBack or EnableViewState]



Thanks, Paul.

-------

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here



TextBox1.Text = "Init value goes in here"



End Sub



Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles Button1.Click



TextBox2.Text = TextBox1.Text '<<This always detects ""Init value goes in

here" even if I've edited it on-screen!!



End Sub









-

Re:Simplest possible question?

"qqq" <qqq@qqq.com>wrote in message news:eedKUQ7ZEHA.1048@tk2msftngp13.phx.gbl...

Quote
Ok, what's wrong with this picture? I have a simple webform with a single

textbox webcontrol and a single webcontrol button. When the form is

displayed, I manually type some new text into the textbox. Why aren't my

updates detected in the button's code?!



Because on every Page_Load you are initializing TextBox1.Text to "Init value goes in here",

therefore whatever you typed (which ASP.NET put into TextBox1.Text prior to Page_Load)

is overwritten by the assignment. After Page_Load, the Button1_Click event fires, and it

will always see "Init value goes in here."



What you probably want to do in Page_Load is only initialize the TextBox1.Text on the first

request to the page (and not re-initialize it on subsequent requests, because the viewstate of

the TextBox will retain it's value).



If ( Not Page.IsPostBack ) Then

TextBox1.Text = "Init value goes in here"

End If





Derek Harmon





-