Creating PDF documents in ASP.NET

Dim doc As Document = New Document
PdfWriter.GetInstance(doc, New FileStream(Request.PhysicalApplicationPath + "\1.pdf",FileMode.Create))

PdfWriter.GetInstance(doc, New FileStream(C:\tmp\1.pdf",FileMode.Create))

Dim font7 As iTextSharp.text.Font = New iTextSharp.text.Font(iTextSharp.text.Font.HELVETICA, 17)
table.AddCell(New Paragraph("blablabla", font7))

Dim document As Document = New Document(PageSize.LETTER.Rotate)

public void ShowTable() 
{ 
    Document doc = new Document(); 
    PdfWriter.GetInstance(doc, new FileStream(Request.PhysicalApplicationPath + "\\2.pdf", FileMode.Create)); 
    doc.Open(); 
    Table table = new Table(3); 
    table.BorderWidth = 1; 
    table.BorderColor = new Color(0, 0, 255); 
    table.Padding = 3; 
    table.Spacing = 1; 
    Cell cell = new Cell("header"); 
    cell.Header = true; 
    cell.Colspan = 3; 
    table.AddCell(cell); 
    cell = new Cell("example cell with colspan 1 and rowspan 2"); 
    cell.Rowspan = 2; 
    cell.BorderColor = new Color(255, 0, 0); 
    table.AddCell(cell); 
    table.AddCell("1.1"); 
    table.AddCell("2.1"); 
    table.AddCell("1.2"); 
    table.AddCell("2.2"); 
    table.AddCell("cell test1"); 
    cell = new Cell("big cell"); 
    cell.Rowspan = 2; 
    cell.Colspan = 2; 
    cell.HorizontalAlignment = Element.ALIGN_CENTER; 
    cell.VerticalAlignment = Element.ALIGN_MIDDLE; 
    cell.BackgroundColor = new Color(192, 192, 192); 
    table.AddCell(cell); 
    table.AddCell("cell test2"); 
    doc.Add(table); 
    doc.Close(); 
    Response.Redirect("~/2.pdf"); 
} 

using System.IO;
using System.Web;
using iTextSharp.text;
using iTextSharp.text.pdf;

public class PDFGenerator
{
    private string sWorkPath;

    public PDFGenerator(HttpContext context)
    {
       sWorkPath = context.Server.MapPath("");
    }

    public void ShowTable()
    {
        
        Document doc = new Document();
        PdfWriter.GetInstance(doc, new FileStream(sWorkPath + "\\pdf\\2.pdf", FileMode.Create));
        doc.Open();
        iTextSharp.text.Table table = new Table(3);
        table.BorderWidth = 1;
        table.BorderColor = new Color(0, 0, 255);
        table.Padding = 3;
        table.Spacing = 1;
        Cell cell = new Cell("header");
        cell.Header = true;
        cell.Colspan = 3;
        table.AddCell(cell);
        cell = new Cell("example cell with colspan 1 and rowspan 2");
        cell.Rowspan = 2;
        cell.BorderColor = new Color(255, 0, 0);
        table.AddCell(cell);
        table.AddCell("1.1");
        table.AddCell("2.1");
        table.AddCell("1.2");
        table.AddCell("2.2");
        table.AddCell("cell test1");
        cell = new Cell("big cell");
        cell.Rowspan = 2;
        cell.Colspan = 2;
        cell.HorizontalAlignment = Element.ALIGN_CENTER;
        cell.VerticalAlignment = Element.ALIGN_MIDDLE;
        cell.BackgroundColor = new Color(192, 192, 192);
        table.AddCell(cell);
        table.AddCell("cell test2");
        doc.Add(table);
        doc.Close();
        HttpContext.Current.Response.Redirect("~/pdf/2.pdf",false);
    }
}

<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

protected void Button1_Click(object sender, EventArgs e)
{
        
    PDFGenerator pdfgen = new PDFGenerator(this.Context);
    pdfgen.ShowTable();
}