upc internet 200+ 17: ASPNET Ajax in .NET

Create UPC Symbol in .NET 17: ASPNET Ajax

17: ASPNET Ajax
UPC Symbol Generator In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create UPC-A Supplement 5 image in ASP.NET applications.
Bar Code Maker In .NET
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Try This
Universal Product Code Version A Creation In Visual C#.NET
Using Barcode drawer for .NET Control to generate, create Universal Product Code version A image in .NET framework applications.
Create UPC-A In .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create UPC A image in VS .NET applications.
Using the Ajax Timer to Load Text Files
Printing UPC Symbol In VB.NET
Using Barcode maker for .NET framework Control to generate, create Universal Product Code version A image in Visual Studio .NET applications.
UCC - 12 Generator In VS .NET
Using Barcode generator for ASP.NET Control to generate, create EAN128 image in ASP.NET applications.
Suppose your client has different services she wishes to offer Rather than having several different links, she d like to have a window on her home page that randomly loads a text file to describe each service She wants to use text files because their content is easy to update Knowing that the page might become unattractively jumpy if the page reloads every time a new text file loads, you decide to use ASPNET 35 Ajax In this way, everything stays put while just the text file content is displayed in a TextBox control You decide to use a TextBox control so that you can keep the message area within the graphic and information design Further, if your client wants to add a lengthy description, the user will be able to scroll to read the whole message The following steps walk you through the application:
UPC Code Encoder In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create Universal Product Code version A image in ASP.NET applications.
Drawing Code 39 Full ASCII In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create USS Code 39 image in ASP.NET applications.
1 Before you get started, create four text files You can use any text editor such as
Drawing Bar Code In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Make ECC200 In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
Microsoft s Notepad or Macintosh s TextEdit Eventually, they will be placed along with your other ASPNET web site files as shown in Figure 17-3
1D Barcode Generation In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create 1D Barcode image in ASP.NET applications.
Leitcode Drawer In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create Leitcode image in ASP.NET applications.
2 Open a new ASPNET web site in Visual Studio 2008 and save it as AjaxTime 3 Open the Solution Explorer and rename Defaultaspx to AjaxTimeaspx
Universal Product Code Version A Reader In Visual Basic .NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Generate UCC.EAN - 128 In Objective-C
Using Barcode maker for iPad Control to generate, create EAN / UCC - 14 image in iPad applications.
Figure 17-3 All text files are placed with the other ASPNET files
Code 128C Drawer In Java
Using Barcode printer for Java Control to generate, create Code 128 Code Set A image in Java applications.
Drawing ANSI/AIM Code 128 In Visual C#.NET
Using Barcode generation for .NET Control to generate, create Code-128 image in .NET applications.
( continued )
EAN / UCC - 13 Creator In VB.NET
Using Barcode generation for .NET Control to generate, create EAN13 image in Visual Studio .NET applications.
Decoding Code 128B In Visual Studio .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
ASPNET 35: A Beginner s Guide
Code 128 Encoder In None
Using Barcode maker for Software Control to generate, create Code 128A image in Software applications.
EAN128 Generation In None
Using Barcode creator for Word Control to generate, create GS1 128 image in Office Word applications.
4 Open the AjaxTimeaspxcs file and change the name of the partial class from _Default
to AjaxTime Check to make sure the Inherits in the AjaxTimeaspx is now changed to AjaxTime as well
5 Select the AjaxTimeaspx tab in the editor and select the Design mode 6 Open the Ajax Extensions menu, and drag an UpdatePanel into the div container
Select the UpdatePanel that you just dragged into the editor
7 Open the Standard Menu and drag a TextBox control into the UpdatePanel In the
Properties window set the Height to 180px, TextMode to Multiline, Width to 247px, ReadOnly to True, BorderStyle to None, BackColor to #99FF33, ForeColor to #333333, and Font to Verdana (To double-check, review the code listing)
8 Open the Ajax Extensions menu again, and drag a Timer control into the UpdatePanel
In the Properties window set the Interval to 5000 (That provides a 5-second interval between events) Switch to the Source view, and add ontick="TimeShow" to the Timer control tag
9 Next, drag a ScriptManager to a space above the <div> tag Review the following
listing, add the CSS, and check your code against it
ASPNET AjaxTimeaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxTimeaspxcs" Inherits="AjaxTime" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <style type="text/css"> #header { font-family:Verdana; font-size:18pt; color:Gray; font-weight:bold; } </style> <title>Ajax Timer</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <span id=header>Our Services</span><br/> <asp:UpdatePanel ID="UpdatePanel1" runat="server">
17: ASPNET Ajax
<ContentTemplate> <asp:TextBox ID="TextBox1" runat="server" Height="180px" TextMode="MultiLine" Width="247px" BackColor="#99FF33" Font-Names="Verdana,Arial,Helvetica,sans-serif" ForeColor="#333333" ReadOnly="True" BorderStyle="None" /> <asp:Timer ID="Timer1" runat="server" Interval="5000" ontick="TimeShow" /> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html>
10 Once you have checked your ASPNET file and saved it, open the AjaxTimeaspxcs
file and replace the default code with the following code (Note that the code is very similar to what you learned in 15 for loading external text files)
C# AjaxTimeaspxcs
using System; using SystemIO; public partial class AjaxTime : SystemWebUIPage { private int counter; private StreamReader readAd; private String readLn; private String adNow; protected void TimeShow(object sender, EventArgs e) { Random Rand = new Random(); counter = RandNext(4); string[] ads= {"Designtxt","Developtxt","Ajaxtxt", "Databasetxt"}; adNow= ads[counter]; TextBox1Text = ""; try{ using(readAd=new StreamReader(MapPath(adNow))) { while((readLn =readAdReadLine())!= null) { TextBox1Text+=readLn +"\n"; } } } catch (Exception ec)
( continued )
ASPNET 35: A Beginner s Guide
{ TextBox1Text="Check the file name It was not found"; TextBox1Text+=ecMessage; } } }
Before you test your code, check the text filenames, including the case, and be sure they are placed in the same folder as the ASPX and ASPXCS files as shown in Figure 17-3 As long as the filenames match those in the string array, ads, your application will function as expected Figure 17-4 shows what you will see when you test your application You have to wait 5 seconds for the first message to appear because the interval is set to 5000 milliseconds (5 seconds) Then, every 5 seconds a different random message appears If random chance twice or more in a row selects the same message, the change is so fast that it will look like no change at all occurred! That s because only the text is updating, not the whole page
Copyright © OnBarcode.com . All rights reserved.