To generate a PDF file using C# language, you can utilize a third-party library such as iTextSharp or PdfSharp. Here’s an example using iTextSharp:

1. First, make sure you have the iTextSharp library installed in your project. You can either download it from the official website or use a package manager like NuGet to install it.
2. Import the necessary namespaces in your code file:

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

3. Write code to create and populate the PDF document. Here’s an example that creates a simple PDF with some text and saves it to a file:

// Create a new document
Document document = new Document();

// Set up the PDF writer and create the file stream
PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("output.pdf", FileMode.Create));

// Open the document for writing
document.Open();

// Add content to the document
document.Add(new Paragraph("Hello, World!"));

// Close the document
document.Close();

4. Build and run your application. After execution, a PDF file named “output.pdf” will be generated in the specified location with the text “Hello, World!”.

This is a basic example of generating a PDF file using iTextSharp. You can further customize the PDF by adding headers, footers, tables, images, and more. Refer to the iTextSharp documentation or samples for more advanced usage.

Remember to handle any necessary exceptions that may occur during the PDF generation process and ensure proper disposal of resources when you’re finished using the library.