Redirect and Convert Web Page to PDF and download as ZIP file using C# and VB.Net in ASP.Net

Hi KatieNgoc,

Refer below sample.

HTML

CS.aspx

<asp:DropDownList ID="FormList" runat="server">
</asp:DropDownList>
<asp:Button ID="Redirect" runat="server" Text="Load  A Form" OnClick="Next_Click" />

Namespaces

C#

using System.Data;
using System.Text;
using System.IO;
using iTextSharp.text.pdf;
using iTextSharp.text;
using iTextSharp.text.html.simpleparser;
using Ionic.Zip;

Code

C#

CS.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        if (Session["ListItems"] == null)
        {
            DataTable dt = DropDownItems();
            FormList.DataSource = dt;
            FormList.DataTextField = "Text";
            FormList.DataValueField = "Value";
            FormList.DataBind();
            Session["ListItems"] = dt;
        }
        else
        {
            DataTable dt = (DataTable)Session["ListItems"];
            FormList.DataSource = dt;
            FormList.DataTextField = "Text";
            FormList.DataValueField = "Value";
            FormList.DataBind();
        }
    }
}

private DataTable DropDownItems()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Text");
    dt.Columns.Add("Value");
    dt.Rows.Add("Select one item, click on [Load a Form] button", "0");
    dt.Rows.Add("1.  W-4 IRS Form", "1");
    dt.Rows.Add("2.  Sexual Harassment Policy", "2");
    dt.Rows.Add("3.  Arbitration Agreement", "3");
    dt.Rows.Add("4.  Disciplinary & Attendance Policy", "4");
    dt.Rows.Add("5.  Paid Sick Leave", "5");
    dt.Rows.Add("6.  Authorization for Release of Information", "6");
    dt.Rows.Add("7.  General Code of Safe Practices", "7");
    dt.Rows.Add("8.  A Summary of Your Rights Under the Fair Credit Reporting Act", "8");
    dt.Rows.Add("9.  Meal Period Policy", "9");
    dt.Rows.Add("10. Meal Break Waiver Agreement", "10");
    dt.Rows.Add("11. Rest Period Policy", "11");
    dt.Rows.Add("12. Employee Safety Orientation Sign-Off Sheet", "12");
    dt.Rows.Add("13. Policy Statement Firearms, Weapons-Free Workplace", "13");
    dt.Rows.Add("14. Assignment Abandonment", "14");
    dt.Rows.Add("15. Remedying the Effects of Identity Theft", "15");
    dt.Rows.Add("16. Drug and Alcohol Policy", "16");
    dt.Rows.Add("17. General Safety Video", "17");
    return dt;
}

protected void Next_Click(object sender, EventArgs e)
{
    DataTable newDt = new DataTable();
    newDt.Columns.Add("Text");
    newDt.Columns.Add("Value");
    DataTable dt = (DataTable)Session["ListItems"];
    ListItemCollection liCol = FormList.Items;
    for (int i = 0; i < dt.Rows.Count; i++)
    {
        ListItem li = liCol[i];
        if (li.Selected)
        {
            if (FormList.SelectedItem.Value == "1")
            {
                GetNewDt(newDt, dt, i, "Default.aspx");
            }
            else if (FormList.SelectedItem.Value == "2")
            {
                GetNewDt(newDt, dt, i, "Default.aspx");
            }
            else if (FormList.SelectedItem.Value == "3")
            {
                GetNewDt(newDt, dt, i, "Default.aspx");
            }
        }
    }
}

private void GetNewDt(DataTable newDt, DataTable dt, int i, string url)
{
    dt.Rows[i].Delete();
    newDt.Rows.Add(FormList.SelectedItem.Text, FormList.SelectedItem.Value);
    Session["newdt"] = newDt;
    Response.Redirect(url);
}
protected void Download(object sender, EventArgs e)
{
    using (ZipFile zip = new ZipFile())
    {
        zip.AlternateEncodingUsage = ZipOption.AsNecessary;
        zip.AddDirectoryByName("Files");
        foreach (var filePath in Directory.GetFiles(Server.MapPath("~/File")))
        {
            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();
    }
}

Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = Session["newdt"] as DataTable;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            sb.Append("<p>");
            sb.Append(dt.Rows[i]["Text"] + "" + dt.Rows[i]["Value"]);
            sb.Append("</p>");
            File.WriteAllText(Server.MapPath("~/Filehtml/") + dt.Rows[i]["Value"] + ".htm", sb.ToString());
            using (StringWriter sw = new StringWriter(sb))
            {
                using (HtmlTextWriter hw = new HtmlTextWriter(sw))
                {
                    using (StreamReader sr = new StreamReader(Server.MapPath("~/Filehtml/") + dt.Rows[i]["Value"] + ".htm"))
                    {
                        using (FileStream stream = new FileStream(Server.MapPath("~/File/") + "HTMLExport" + dt.Rows[i]["Value"] + ".pdf", FileMode.Create))
                        {
                            Document pdfDoc = new Document(PageSize.A2, 10f, 10f, 10f, 0f);
                            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                            PdfWriter.GetInstance(pdfDoc, stream);
                            pdfDoc.Open();
                            htmlparser.Parse(sr);
                            pdfDoc.Close();
                            stream.Close();
                        }
                    }
                }
            }
        }
    }
}