Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "PdfReader" and then click OK
Step 2: Right click on your project select Manage NuGet Packages -> Search itextsharp -> Install

iText is a PDF library that allows you to CREATE, ADAPT, INSPECT and MAINTAIN documents in the Portable Document Format, allowing you to add PDF functionality to your software projects with ease.
Step 3: Design your form as below

Step 4: Add code to handle your form
using iTextSharp.text.pdf.parser;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PdfReader
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnOpen_Click(object sender, EventArgs e)
{
using(OpenFileDialog ofd = new OpenFileDialog() { Filter="PDF files|*.pdf", ValidateNames = true, Multiselect = false })
{
if(ofd.ShowDialog() == DialogResult.OK)
{
try
{
iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(ofd.FileName);
StringBuilder sb = new StringBuilder();
for(int i = 1; i <= reader.NumberOfPages; i++)
{
//Read page
sb.Append(PdfTextExtractor.GetTextFromPage(reader, i));
}
richTextBox.Text = sb.ToString();
reader.Close();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
}
}
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