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Why text box is not clear
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This message was discovered on ASPFriends.com 'aspngcs' list.


Vo Thanh Hoa
Hi group

Sorry for my stupic question below

I put one button and one text box into a form of an ASP.NET page. Thay are all web control. I deleberately set EnableViewState of the text box to false. The content of the text has nothing. In the code-behind of the correspoinding class
I set the text property of the text control to something like "Yamaha Toyota OShama Bin Laden" only when the page is not postback. Here is the code

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
TextBox1.Text = " Yamaha Toyota OShama Bin Laden";
}
}
But when I run this page and hit the button. The content of the text box is not change. I think because I have set its EnableViewState to false so when the page is postback. It should be clear. I have test other control like list box. But its ( the list box) content is clear. Any one have idea ? It seem not consistency, is it ?

Best regard.
Reply to this message...
 
    
Andy Smith
your textbox is not emptied after postback, because the textbox gets =
everything it needs to know from just the post. It recieves it's text =
value from the post. however, it won't be able to know if it has been =
changed from before without viewstate.

your listbox was empty after postback because the only thing it gets =
back from the postback is the selected value. it does not get the list =
of items it contains. If you were to staticly populate the listbox right =
on the page or in an Init handler, then the listbox would be able to =
show it's selected value after postback.

__
Andy Smith
Keyboard Jockey #3a7-2.78.1

[Original message clipped]
Reply to this message...
 
    
Hue Phung
Hi group

Sorry for my stupic question below

I put one button and one text box into a form of an ASP.NET page. Thay are all web control. I deleberately set EnableViewState of the text box to false. The content of the text has nothing. In the code-behind of the correspoinding class
I set the text property of the text control to something like "Yamaha Toyota OShama Bin Laden" only when the page is not postback. Here is the code

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
TextBox1.Text = " Yamaha Toyota OShama Bin Laden";
}
}
But when I run this page and hit the button. The content of the text box is not change. I think because I have set its EnableViewState to false so when the page is postback. It should be clear. I have test other control like list box. But its ( the list box) content is clear. Any one have idea ? It seem not consistency, is it ?

Best regard.
Reply to this message...
 
    
Vo Thanh Hoa
Hi group
=20
Sorry for my stupic question below
=20
I put one button and one text box into a form of an ASP.NET page. Thay are all web control. I deleberately set EnableViewState of the text box to false. The content of the text has nothing. In the code-behind of the correspoinding class
I set the text property of the text control to something like "Yamaha Toyota OShama Bin Laden" only when the page is not postback. Here is the code
=20
private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
TextBox1.Text =3D " Yamaha Toyota OShama Bin Laden";=20
}
}
But when I run this page and hit the button. The content of the text box is not change. I think because I have set its EnableViewState to false so when the page is postback. It should be clear. I have test other control like list box. But its ( the list box) content is clear. Any one have idea ? It seem not consistency, is it ?=20
=20
Best regard.
=20
Reply to this message...
 
    
Vo Thanh Hoa
Thank Andy=20
Maybe I undestand now. I have reviewed .NET document.=20
When postbacking, my text box's content is set two times, from =
ViewState data and Postback data.
My textbox's content is not clear because of Postback data.=20

-----Original Message-----
From: Andy Smith [mailto:Click here to reveal e-mail address]
Sent: Thursday, July 11, 2002 10:37 PM
To: aspngcs
Subject: [aspngcs] RE: Why text box is not clear

your textbox is not emptied after postback, because the textbox gets =
everything it needs to know from just the post. It recieves it's text =
value from the post. however, it won't be able to know if it has been =
changed from before without viewstate.

your listbox was empty after postback because the only thing it gets =
back from the postback is the selected value. it does not get the list =
of items it contains. If you were to staticly populate the listbox right =
on the page or in an Init handler, then the listbox would be able to =
show it's selected value after postback.

__
Andy Smith
Keyboard Jockey #3a7-2.78.1

[Original message clipped]

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[Original message clipped]
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System.EventArgs




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