How to create pdf file using iTextSharp 5.1

add reference of iTextSharp dll in your project.
you can download iTextsharp dll from http://sourceforge.net/projects/itextsharp/



  Document document = new Document(PageSize.A4, 50, 50, 25, 25);

// Create a new PdfWriter object, specifying the output stream
var output = new FileStream(Server.MapPath("MyFirstPDF.pdf"), FileMode.Create);
PdfWriter.GetInstance(document, output);

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

... Step 3: Add elements to the document! ...

Paragraph welcomeParagraph = new Paragraph("Hello, World!");

// Add the Paragraph object to the document
document.Add(welcomeParagraph);

// Close the Document - this saves the document contents to the output stream
document.Close();