x509certificate2以编程方式在PDF上添加数字签名

# Product Installation using NuGet
nuget install IronPdf

using System.Drawing;
using System.Windows.Forms;
using IronPdf;

namespace DigitalSign
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent(); 
        }

        private void button1_Click(object sender, System.EventArgs e)
        {
            // Open a dialog to select the desired PDF file
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = openFileDialog1.FileName; // Display selected PDF path in the textbox
            }
        }

        private void button2_Click(object sender, System.EventArgs e)
        {
            // Use PdfSignature method to digitally sign the selected PDF
            new PdfSignature("Ironpdf.pfx", "123456").SignPdfFile(textBox1.Text);

            // Provide user feedback that signing is complete
            label3.Text = "Completed!";
            label3.BackColor = Color.LightGreen;
            label3.ForeColor = Color.Black;
        }
    }
}

Imports System.Drawing
Imports System.Windows.Forms
Imports IronPdf

Namespace DigitalSign
	Partial Public Class Form1
		Inherits Form

		Public Sub New()
			InitializeComponent()
		End Sub

		Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
			' Open a dialog to select the desired PDF file
			If openFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
				textBox1.Text = openFileDialog1.FileName ' Display selected PDF path in the textbox
			End If
		End Sub

		Private Sub button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
			' Use PdfSignature method to digitally sign the selected PDF
			Call (New PdfSignature("Ironpdf.pfx", "123456")).SignPdfFile(textBox1.Text)

			' Provide user feedback that signing is complete
			label3.Text = "Completed!"
			label3.BackColor = Color.LightGreen
			label3.ForeColor = Color.Black
		End Sub
	End Class
End Namespace