In order to encrypt a PDF file, you can set two types of PDF passwords. The samples below will show you how to use three programming languages including ASP.NET, C#, and VB.NET to encrypt PDF. The tool employed here is VeryPDF PDF Toolbox.
C# code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Call_PDFToolBoxCom
{
class Program
{
static void Main(string[] args)
{
string strExePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
PDFToolBoxCom.PDFToolBoxCom p = new PDFToolBoxCom.PDFToolBoxCom();
string strReturn = p.RunCMD(strExePath + @"\secured.pdf -inputpassword foopass -outfile " + strExePath + @"\unsecured.pdf");
Console.WriteLine(strReturn);
Console.WriteLine("Please enter any key to continue...");
Console.ReadKey();
}
}
}
VB.NET code:
Module Module1
Sub Main()
Dim p As PDFToolBoxCom.PDFToolBoxCom
Dim strRet As String
Dim strParam As String
Dim strPath As String
strPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase
strParam = strPath + "pdftoolbox.exe " + strPath + "secured.pdf" + " -inputpassword foopass -outfile " + strPath + "unsecured.pdf"
Console.WriteLine(strParam)
p = New PDFToolBoxCom.PDFToolBoxCom()
strRet = p.RunCMD(strParam)
Console.WriteLine(strRet)
Console.WriteLine("Please enter any key to continue...")
Console.ReadKey()
End Sub
End Module
ASP_NET code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ASP_NET_Call_PDFToolBoxCom
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{}
protected void Button1_Click(object sender, EventArgs e)
{
Console.WriteLine("UserName: {0}", Environment.UserName);
PDFToolBoxCom.PDFToolBoxCom p = new PDFToolBoxCom.PDFToolBoxCom();
string strPath = @"E:\bin\pdftoolbox.exe";
strPath += @" secured.pdf -inputpassword foopass -outfile unsecured.pdf";
string strRet = p.RunCMD(strPath);
Response.Write(strRet);
}
}
}
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Lear more: VeryPDF PDF Toolbox Component for .NET.