How to protect pdf file from copying, saving and downloading in c#.net

Hi Da,


File download after a valid login.

Default.aspx code

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>





   


   

   

   
                Text="Download Oracle9i" BackColor="#80FFFF" ForeColor="Black"
            Width="133px" Font-Bold="True"/>

   

   

Default.aspx.cs code
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Default2.aspx?file=" + "Oracle.pdf");

    }
}



Default2.aspx code
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>





   


   

   

   
   

   

Default2.aspx.cs code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class Default2 : System.Web.UI.Page
{
    string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    DataSet ds = new DataSet();
    SqlCommand cmd = new SqlCommand();
  
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["username"] == null && Session["Password"] == null)
        {
            Response.Redirect("login.aspx");
        }
        else
        {
            string strRequest = Request.QueryString["file"];
            if (strRequest != "")
            {
                //get absolute path of the file
                // the file is passed like a web address /images/myimage.jpg
                string path = Server.MapPath(strRequest); //get file object as FileInfo 
                System.IO.FileInfo file = new System.IO.FileInfo(path); //-- if the file exists on the server 


                if (file.Exists) //set appropriate headers 
                {
                    Response.Clear();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    Response.ContentType = "application/octet-stream";


                    // write file to browser
                    Response.WriteFile(file.FullName);
                    Response.End();
                }
                else
                {
                    // if file does not exist
                    Response.Write("This file does not exist.");
                }
            }
            else
            {
                //nothing in the URL as HTTP GET
                Response.Write("Please provide a file to download.");
            }
        }
  
    }

   
}


login.aspx code


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="login.aspx.cs" Inherits="login" %>





   


   

   

   
       
                    ControlToValidate="TextBox1" ErrorMessage="Required User name">
       

       
       
   
       
       
   
                    ControlToValidate="TextBox2" ErrorMessage="Required Password">
   
       
       
   
   

            Width="100px" />
   
   




login.aspx.cs code
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class login : System.Web.UI.Page
{
    string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    DataSet ds = new DataSet();
    SqlCommand cmd = new SqlCommand();
    SqlConnection con;

    protected void Button1_Click(object sender, EventArgs e)
    {
        con = new SqlConnection(connStr);
        con.Open();
        string str = "select UserName,Password from Login";
        cmd = new SqlCommand(str, con);
        SqlDataReader reader;
        reader = cmd.ExecuteReader();
          Session["username"] = TextBox1.Text ;
          Session["Password"] = TextBox2.Text;
          while (reader.Read())
        {
            if ((Session["username"].ToString() == reader["UserName"].ToString()) & (Session["Password"].ToString() == reader["Password"].ToString()))
            {
                Response.Redirect("Default.aspx");
            }
            else
            {
               Label3.Text="Invalid username or password";
            }
        }
       
    }
}



Thanks