ASP.NET AJAX UpdateProgress Control in VB.NET

In this article we will learn how to use UpdateProgress control in ASP.NET AJAX.
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In this article we will learn how to use UpdateProgress control in ASP.NET AJAX.

UpdateProgress control

The UpdateProgress control is very important control. The UpdateProgress control provides status information about partial-page updates in UpdatePanel controls. You can customize the default content and the layout of the UpdateProgress control. To prevent flashing when a partial-page update is very fast, you can specify a delay before the UpdateProgress control is displayed.

Properties

These are the following properties of the timer control.

up.gif

Figure 1

For example

Drag one ScriptManager control, one updateProgress and one button on the form. The form looks like this.

upd2.gif

Figure 2

Now, when we click the button the script sleeps for 5 seconds and the "Loading..." text is displayed on your page.

Now click on the source button of the design form and add the following code.

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication30.WebForm1" %>

<!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 id="Head1" runat="server">

    <title>How to Use UpdateProgress control</title>

    <style type="text/css">

        .PleaseWait

        {

            height : 13px;

            width: 150;

            background-image: url(images/PleaseWait.gif);

            background-repeat: no-repeat;

        }

    </style>

</head>

<body>

    <form id="form1" runat="server">

        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <asp:UpdateProgress runat="server" id="PageUpdateProgress">

            <ProgressTemplate>

            <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">

<title>New Page 3</title>

<p>

<img border="0" src="file:///C:/Users/Rohatash/Downloads/ajax-loader(2).gif" width="32" height="32"></p>

                <div class= "PleaseWait" align="left">

                Loading...

                </div>

            </ProgressTemplate>

        </asp:UpdateProgress>

        <asp:UpdatePanel runat="server" id="Panel">

            <ContentTemplate>

                <br />

                <asp:Button runat="server" id="UpdateButton" onclick="UpdateButton_Click" text="Update" />

            </ContentTemplate>

        </asp:UpdatePanel>

    </form>

</body>

</html>

 

Now move to the design window and double click on the update button and add the following code.

 

Protected Sub UpdateButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles UpdateButton.Click

        System.Threading.Thread.Sleep(5000)

    End Sub

 

Now save and run the application.


upd3.gif
 

Figure 3


Now click on the update button control.

 

upd4.gif
 

Figure 4

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