Web progress bar is a user friendly UI factor to web applicaion. In this tutorial, we will show you how to create a web progress bar using ASP.NET 2.0 and C#.
First, to create a WebProgressBar.aspx page and WebProgressBar.aspx.cs. Then import the System.Web.SessionState, System.Text and System.Threading namespaces.
The System.Web.SessionState namespace supplies classes and interfaces that enable storage of data specific to a single client within a Web application on the server. The session-state data is used to give the client the appearance of a persistent connection with the application. While the System.Threading namespace provides classes and interfaces that enable multithreaded programming.
| using System.Web.SessionState; using System.Text; using System.Threading; |
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In order to demo the progress bar clearly, we simulate a long task by using the Thread.Sleep method to block the current thread for the specified number of milliseconds. Each block represent the different state. The session state value will be changed after each block.
The method of showModalDialog is used to create a modal dialog box that displays the specified HTML of progress bar.
| Private Sub LongTask() private void LongTask() { for (int i = 0; i < 11; i++) { System.Threading.Thread.Sleep(1000); Session["State"] = i + 1; } Session["State"] = 100; } public static void OpenProgressBar(System.Web.UI.Page Page) { StringBuilder sbScript = new StringBuilder(); }sbScript.Append(" \n"); Page.RegisterClientScriptBlock("OpenProgressBar", sbScript.ToString()); |
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Button1_Click event is for starting the threads.| public void Button1_Click(object sender, System.EventArgs e) { Thread thread = new Thread(new ThreadStart(LongTask)); } thread.Start(); Session["State"] = 1; OpenProgressBar(this.Page); |
The front WebProgressBar.aspx page looks something like this:
| <body> <form id="form1" runat="server"> <fieldset> <legend>WebProgressBar</legend> <div> <asp:Button id="Button1" runat="server" Text="Start Long Task!" OnClick="Button1_Click"></asp:Button> </div></fieldset> </form> </body> |
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In order to show the progress strip, we created Progress.aspx page. The bar will be refershed based on the session states, therefore, we can show the progress. The code behind page is as follows.| private int state = 0; protected void Page_Load(object sender, EventArgs e) { if (Session["State"] != null) { state = Convert.ToInt32(Session["State"].ToString()); }else { Session["State"] = 0; }if (state > 0 && state <= 10) { this.lblMessages.Text = "Processing..."; }this.panelProgress.Width = state * 30; this.lblPercent.Text = state * 10 + "%"; Page.RegisterStartupScript("", " "); if (state == 100) { this.panelProgress.Visible = false; }this.panelBarSide.Visible = false; this.lblMessages.Text = "Task Completed!"; Page.RegisterStartupScript("", " "); } |
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The front progress.aspx page looks something like this:| <body> <form id="Form1" method="post" runat="server"> <asp:Label id="lblMessages" runat="server"></asp:Label> <asp:Panel id="panelBarSide" runat="server" Width="300px" BorderStyle="Solid" BorderWidth="1px" ForeColor="Silver"> <asp:Panel id="panelProgress" runat="server" Width="10px" BackColor="Green"></asp:Panel> </asp:Panel> <asp:Label id="lblPercent" runat="server" ForeColor="Blue"></asp:Label> </form> </body> |
The whole WebProgressBar.aspx for the code behind page is as follows.
| using System; using System.Data; using System.Configuration; using System.Collections; 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; using System.Web.SessionState; using System.Text; using System.Threading; public partial class WebProgressBar : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } private void LongTask() { for (int i = 0; i < 11; i++) { System.Threading.Thread.Sleep(1000); Session["State"] = i + 1; } Session["State"] = 100; } public static void OpenProgressBar(System.Web.UI.Page Page) { StringBuilder sbScript = new StringBuilder(); }sbScript.Append(" \n"); Page.RegisterClientScriptBlock("OpenProgressBar", sbScript.ToString()); public void Button1_Click(object sender, System.EventArgs e) { Thread thread = new Thread(new ThreadStart(LongTask)); }thread.Start(); Session["State"] = 1; OpenProgressBar(this.Page); } |
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The whole progress.aspx for the code behind page is as follows.| using System; using System.Data; using System.Configuration; using System.Collections; 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 Progress : System.Web.UI.Page { private int state = 0; } protected void Page_Load(object sender, EventArgs e) { if (Session["State"] != null) { state = Convert.ToInt32(Session["State"].ToString()); }else { Session["State"] = 0; }if (state > 0 && state <= 10) { this.lblMessages.Text = "Processing..."; }this.panelProgress.Width = state * 30; this.lblPercent.Text = state * 10 + "%"; Page.RegisterStartupScript("", " "); if (state == 100) { this.panelProgress.Visible = false; }this.panelBarSide.Visible = false; this.lblMessages.Text = "Task Completed!"; Page.RegisterStartupScript("", " "); } |
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