Generate Password Protect Zip file in ASP.Net

Hi anirudhp,

Please refer below sample.

You will need to download the DotNetZip Library DLL using the Download Link provided below. Download DotNetZip Or your will find the DLL in the attached sample at the end of the article. Once you have the DLL you need to place the Ionic.Zip.Reduced.dll in the BIN Folder.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EmptyDataText="No files available">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="chkSelect" runat="server" />
                <asp:Label ID="lblFilePath" runat="server" Text='<%# Eval("Value") %>' Visible="false"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="Text" HeaderText="File Name" />
    </Columns>
</asp:GridView>
<br />
<asp:Button ID="btnDownload" runat="server" Text="Download" OnClick="DownloadFiles" />

Namespaces

C#

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

VB.Net

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

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string[] filePaths = Directory.GetFiles(Server.MapPath("~/Files/"));
        List<ListItem> files = new List<ListItem>();
        foreach (string filePath in filePaths)
        {
            files.Add(new ListItem(Path.GetFileName(filePath), filePath));
        }
        GridView1.DataSource = files;
        GridView1.DataBind();
    }
}
protected void DownloadFiles(object sender, EventArgs e)
{

    using (ZipFile zip = new ZipFile())
    {
        zip.AlternateEncodingUsage = ZipOption.AsNecessary;
        zip.Password = "123";
        zip.AddDirectoryByName("Files");
        foreach (GridViewRow row in GridView1.Rows)
        {
            if ((row.FindControl("chkSelect") as CheckBox).Checked)
            {
                string filePath = (row.FindControl("lblFilePath") as Label).Text;
                zip.AddFile(filePath, "Files");
            }
        }
        Response.Clear();
        Response.BufferOutput = false;
        string zipName = String.Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"));
        Response.ContentType = "application/zip";
        Response.AddHeader("content-disposition", "attachment; filename=" + zipName);
        zip.Save(Response.OutputStream);
        Response.End();
    }
}

 VB.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Dim filePaths As String() = Directory.GetFiles(Server.MapPath("~/Files/"))
        Dim files As New List(Of ListItem)()
        For Each filePath As String In filePaths
            files.Add(New ListItem(Path.GetFileName(filePath), filePath))
        Next
        GridView1.DataSource = files
        GridView1.DataBind()
    End If
End Sub
Protected Sub DownloadFiles(sender As Object, e As EventArgs)
    Using zip As New ZipFile()
        zip.AlternateEncodingUsage = ZipOption.AsNecessary
        zip.Password = "123"
        zip.AddDirectoryByName("Files")
        For Each row As GridViewRow In GridView1.Rows
            If TryCast(row.FindControl("chkSelect"), CheckBox).Checked Then
                Dim filePath As String = TryCast(row.FindControl("lblFilePath"), Label).Text
                zip.AddFile(filePath, "Files")
            End If
        Next
        Response.Clear()
        Response.BufferOutput = False
        Dim zipName As String = [String].Format("Zip_{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"))
        Response.ContentType = "application/zip"
        Response.AddHeader("content-disposition", "attachment; filename=" + zipName)
        zip.Save(Response.OutputStream)
        Response.[End]()
    End Using
End Sub

Screenshot