In this post I am going to show how to download file asynchronously from server
using asp.net.
- Open Visual Studio and create a new WebApplication or WebSite
- Open Default.aspx page and paste following code
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Async="true" %> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title></title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script> </head> <body> <script type="text/javascript"> function WaitProgress() { $("#Indicator").text("please wait..."); } function FinishProgress(contentState) { $("#Indicator").text(contentState); } </script> <form id="form1" runat="server"> <asp:Button ID="btnDownload" runat="server" Text="DownLoadData" OnClientClick="WaitProgress();" OnClick="btnDownload_Click" /> <p id="Indicator"> </p> </form> </body> </html>
- Open Default.aspx.cs file and pate following code
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Threading; using System.Net; public partial class _Default : System.Web.UI.Page { private const string FILE_PATH = @"C:\Temp\test.pdf"; protected void btnDownload_Click(object sender, EventArgs e) { DownLoadFile(); } private void DownLoadFile() { //define the url string url = "http://www.daikodo.com/genki-back/back-img/10genki-2.jpg"; //define the local path string filepath = FILE_PATH; Uri uri = new Uri(url); WebClient client = new WebClient(); client.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(client_DownloadFileCompleted); client.Credentials = new NetworkCredential(); client.DownloadFileAsync(uri, filepath); } void client_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e) { string contentState = "File Downloaded Successfully!!!"; if (e.Error != null) { contentState = e.Error.Message; } else { object userstate = e.UserState; this.ClientScript.RegisterStartupScript(this.GetType(), "finishDownload", "FinishProgress('" + contentState + "');", true); } } }
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