Download Multiple Files As Zip File Archive In Asp.Net

This Example Explains How To Download Multiple Files As Zip File Archive From Server In Asp.Net.

I have placed one CheckBoxList on asp.net page to Display Files From Server And One button to Download Zip File Archives.

I have used DotNetZip Library to Create Zip File from selected file(s), Add Ionic.Zip.dll in Bin folder in application root.

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

---

using System;
using System.Web.UI.WebControls;
using System.IO;
using Ionic.Zip;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DirectoryInfo directory = new DirectoryInfo(Server.MapPath("~/csharpdotnetfreak.blogspot.com"));
            FileInfo[] filesInFolder = directory.GetFiles("*.*", SearchOption.AllDirectories);
            foreach (FileInfo fileInfo in filesInFolder)
            {
                checkBoxList.Items.Add(fileInfo.Name);
            }
        }

    }
    protected void btnDownload_Click(object sender, EventArgs e)
    {
        ZipFile multipleFiles = new ZipFile();
        Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip");
        Response.ContentType = "application/zip";
        foreach (ListItem fileName in checkBoxList.Items)
        {
            if (fileName.Selected)
            {
                string filePath = Server.MapPath("~/csharpdotnetfreak.blogspot.com" + fileName.Value);
                multipleFiles.AddFile(filePath,string.Empty);
            }
        }
        multipleFiles.Save(Response.OutputStream);
    }
}

VB.NET

---

Imports System.Web.UI.WebControls
Imports System.IO
Imports Ionic.Zip

Public Partial Class _Default
 Inherits System.Web.UI.Page
 Protected Sub Page_Load(sender As Object, e As EventArgs)
  If Not IsPostBack Then
   Dim directory As New DirectoryInfo(Server.MapPath("~/csharpdotnetfreak.blogspot.com"))
   Dim filesInFolder As FileInfo() = directory.GetFiles("*.*", SearchOption.AllDirectories)
   For Each fileInfo As FileInfo In filesInFolder
    checkBoxList.Items.Add(fileInfo.Name)
   Next
  End If

 End Sub
 Protected Sub btnDownload_Click(sender As Object, e As EventArgs)
  Dim multipleFiles As New ZipFile()
  Response.AddHeader("Content-Disposition", "attachment; filename=DownloadedFile.zip")
  Response.ContentType = "application/zip"
  For Each fileName As ListItem In checkBoxList.Items
   If fileName.Selected Then
    Dim filePath As String = Server.MapPath("~/csharpdotnetfreak.blogspot.com" & fileName.Value)
    multipleFiles.AddFile(filePath, String.Empty)
   End If
  Next
  multipleFiles.Save(Response.OutputStream)
 End Sub
End Class

Download Sample Code

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