how to use update panel in textbox and label.

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Hye..
My question is really simple. i am about to make a forum in my system. just like this code project forum. the question is how to make a preview section after user has entered text in the textbox? just like the preview section below.

I have been trying this code but the label doesn't come out:

XML

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="testupdatet.aspx.vb" Inherits="testupdatet" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <br />
        <br />
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
             <fieldset>
                <asp:TextBox ID="TextBox1" runat="server" Height="34px" Width="249px"></asp:TextBox>
                <br />
                <br />
                <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
                <br />
                <br />
                <asp:Label ID="Label1" runat="server"></asp:Label>
                <br />
                <br />
                <asp:Label ID="Label2" runat="server"></asp:Label>
                  </fieldset>
            </ContentTemplate>
        </asp:UpdatePanel>
        <br />
        <br />
    
    </div>
    </form>
</body>
</html>

this is my vb code:

VB

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
       Label1.Text = TextBox1.Text

   End Sub

   Protected Sub TextBox2_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
       Label2.Text = TextBox2.Text
   End Sub

Posted 22-Apr-11 9:03am

snamyna

Updated 22-Apr-11 9:09am

Henry Minute

v2

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Tarakeshwar Reddy · Accepted Answer · 2011-04-22T14:32:00

You will have to set the textbox's AutoPostBack="true" and also set the OnTextChanged of the textbox. The textbox's text changed event will fire only when you tab out of the control, it will not fire for each key press.

ASP

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
            <ContentTemplate>
             <fieldset>
                <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
                <br />
                <br />
                <asp:TextBox ID="TextBox2" runat="server" AutoPostBack="true" OnTextChanged="TextBox2_TextChanged"></asp:TextBox>
                <br />
                <br />
                <asp:Label ID="Label1" runat="server"></asp:Label>
                <br />
                <br />
                <asp:Label ID="Label2" runat="server"></asp:Label>
                  </fieldset>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    </form>
</body>
</html>