If you wan to create pdf file in windows form as well as web application , you must to add iTextSharp.dll file as a reference. In iTextSharp , we have a Document class through which we can create a new document. Also provide PdfWriter class, through which we can create a pdf file in a specified path. Now, you can use Paragraph class for creating text. Now, use this code and Generate pdf file:

Document d1 = new Document();

            PdfWriter.GetInstance(d1, new FileStream("E:/t1.pdf", FileMode.Create));

            d1.Open();

            Paragraph p1 = new Paragraph("Hello World");

            d1.Add(p1);

            d1.Close();

Video cover all such things which is i mentioned in above. Also provide the link where you can download the iTextSharp.dll file and where you will put the mentioned code in function.