Download Multiple Files As Zip File In Asp.Net

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This Example Explains how to Download Multiple Files As Zip File From Server In Asp.Net.

I have placed one CheckBoxList on Aspx page to Display Files From Server And One button to download Zip Archives.

I have used DotNetZip Library to Create Zip Files from selected file(s), Add Ionic.Zip.dll in Bin folder in application root.
Download Multiple files As Zip FIle In Asp.Net

HTML SOURCE OF PAGE
   1:  <form id="form1" runat="server">
   2:  <div>
   3:  <asp:CheckBoxList ID="checkBoxList" runat="server"/>
   4:   
   5:  <asp:Button ID="btnDownload" runat="server" 
   6:              onclick="btnDownload_Click" 
   7:              Text="Download Files" />
   8:  </div>
   9:  </form>

C# CODE
01using System;
02using System.Web.UI.WebControls;
03using System.IO;
04using Ionic.Zip;
05 
06public partial class _Default : System.Web.UI.Page
07{
08    protected void Page_Load(object sender, EventArgs e)
09    {
10        if (!IsPostBack)
11        {
12            DirectoryInfo directory = new DirectoryInfo(Server.MapPath("~/www.CsharpAspNetArticles.com"));
13            FileInfo[] filesInFolder = directory.GetFiles("*.*", SearchOption.AllDirectories);
14            foreach (FileInfo fileInfo in filesInFolder)
15            {
16                checkBoxList.Items.Add(fileInfo.Name);
17            }
18        }
19 
20    }
21    protected void btnDownload_Click(object sender, EventArgs e)
22    {
23        ZipFile multipleFiles = new ZipFile();
24        Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip");
25        Response.ContentType = "application/zip";
26        foreach (ListItem fileName in checkBoxList.Items)
27        {
28            if (fileName.Selected)
29            {
30                string filePath = Server.MapPath("~/www.CsharpAspNetArticles.com/" + fileName.Value);
31                multipleFiles.AddFile(filePath,string.Empty);
32            }
33        }
34        multipleFiles.Save(Response.OutputStream);
35    }
36}

VB.NET CODE
01Imports System.Web.UI.WebControls
02Imports System.IO
03Imports Ionic.Zip
04 
05Public Partial Class _Default
06 Inherits System.Web.UI.Page
07 Protected Sub Page_Load(sender As Object, e As EventArgs)
08  If Not IsPostBack Then
09   Dim directory As New DirectoryInfo(Server.MapPath("~/www.CsharpAspNetArticles.com"))
10   Dim filesInFolder As FileInfo() = directory.GetFiles("*.*", SearchOption.AllDirectories)
11   For Each fileInfo As FileInfo In filesInFolder
12    checkBoxList.Items.Add(fileInfo.Name)
13   Next
14  End If
15 
16 End Sub
17 Protected Sub btnDownload_Click(sender As Object, e As EventArgs)
18  Dim multipleFiles As New ZipFile()
19  Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip")
20  Response.ContentType = "application/zip"
21  For Each fileName As ListItem In checkBoxList.Items
22   If fileName.Selected Then
23    Dim filePath As String = Server.MapPath("~/www.CsharpAspNetArticles.com/" & fileName.Value)
24    multipleFiles.AddFile(filePath, String.Empty)
25   End If
26  Next
27  multipleFiles.Save(Response.OutputStream)
28 End Sub
29End Class


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