Tutorial: Introduction to AJAX UpdateProgress Control in ASP.NET and C#
 
| Tutorial: Introduction to AJAX UpdateProgress Control in ASP.NET and C# |
This tutorial was created with Microsoft's ASP.NET AJAX Extensions, which can be downloaded at this link
In this tutorial, we will introduce you to the AJAX UpdateProgress. This Control can be used to give the user more information about what is going on when AJAX is processing a request. Because AJAX is Asynchronous and runs in the background, there is no default status and the user doesn't know if anything is happening or not, until the process is complete. This is not usually a problem on the faster servers, but we can use the UpdateProgress to tell the user that AJAX is dealing with the process and will complete soon.
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First, we start by creating an AJAX-Enabled web site in Visual Studio .NET 2005, with the AJAX Extensions installed.
The AJAX Extensions (from Microsoft) make it a whole lot easier to create AJAX web pages, as Visual Studio will add in the necessary assembly references, etc. into the Web.config
When we first open our Default.aspx page, we should already have a Script Manager:
| <asp:ScriptManager ID="ScriptManager1" runat="server" /> |
Next, we are going to add two UpdateProgress Controls, two UpdatePanel Controls. Inside the UpdateProgress will be the message displayed to the user when the AJAX is processing the request. We can also add an animated GIF in here, if preferred.
<asp:UpdateProgress runat="server" id="PageUpdateProgress1" AssociatedUpdatePanelID="UpdatePanel1" DynamicLayout="false">
<ProgressTemplate>
Processing Request from Update 1. Please Wait..
</ProgressTemplate>
<asp:UpdatePanel runat="server" id="UpdatePanel1">
<ContentTemplate>
<asp:Button runat="server" id="UpdateButton" onclick="UpdateButton_Click" text="Update 1" />
</ContentTemplate>
<asp:UpdateProgress runat="server" id="UpdateProgress2" AssociatedUpdatePanelID="UpdatePanel2" DynamicLayout="false">
<ProgressTemplate>
Processing Request from Update 2. Please Wait..
</ProgressTemplate>
<asp:UpdatePanel runat="server" id="UpdatePanel2">
<ContentTemplate>
<asp:Button runat="server" id="UpdateButton2" onclick="UpdateButton2_Click" text="Update 2" />
</ContentTemplate> |
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Note the attributes of the UpdateProgress Controls AssociatedUpdatePanelID and DynamicLayout. This allows us to have multiple UpdateProgress Controls on the same page, and each be associated with a different UpdatePanel. The DynamicLayout set to false will reserve space for the contents of this control. This means that there will be a space on the page for where the contents will appear.
The ASPX page will look something like this:
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdateProgress runat="server" id="PageUpdateProgress1" AssociatedUpdatePanelID="UpdatePanel1" DynamicLayout="false">
<ProgressTemplate>
Processing Request from Update 1. Please Wait..
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel runat="server" id="UpdatePanel1">
<ContentTemplate>
<asp:Button runat="server" id="UpdateButton" onclick="UpdateButton_Click" text="Update 1" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress runat="server" id="UpdateProgress2" AssociatedUpdatePanelID="UpdatePanel2" DynamicLayout="false">
<ProgressTemplate>
Processing Request from Update 2. Please Wait..
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel runat="server" id="UpdatePanel2">
<ContentTemplate>
<asp:Button runat="server" id="UpdateButton2" onclick="UpdateButton2_Click" text="Update 2" />
</ContentTemplate>
</asp:UpdatePanel> |
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Now we can add logic to the buttons with the UpdatePanels. For this demonstration, we will make the script goto sleep for 5 seconds to show how the UpdateProgress is displayed.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UpdateButton_Click(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(5000);
}
protected void UpdateButton2_Click(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(5000);
} |
|
| Comments |
Sunil said:
Hello.
I tried this example. But I didn't saw the message "Processing Request from Update 1. Please Wait.." or the other.
The page does take 5 seconds to load but no message is displayed.
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smita said:
its not showing as it explains after running the application as Sunil says
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Vlad said:
I am using VS 2008. I had no problem.
Except when I press second button, overwrites the first...
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Nitin said:
If you put the current thread to sleep, the page lifecycle will be halted.
This would cause a delay in loading up of assmblies and hence the Sys library would not be available at the time when page is init.
|
Anand Singh said:
Great...........I's working fine....................
Thank's
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D.K.Bhagat said:
No. it is not working in Asp.Net 2.0
update panel is working fine... You can see the partial rendering on a page.....
But the progress bar is not showing up...
Sorry, but it is not working at my end.
Thanks.
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Shails said:
Its not working, I tried on .NET 2.0 is it for .NET 3.0
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What an excellent blog! If you put the current thread to sleep, the page lifecycle will be halted.
This would cause a delay in loading up of assmblies and hence the Sys library would not be available at the time when page is init.
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