How to create PDF

protected void btnRemove_Click(object sender, EventArgs e)
{
Document document = new Document();
string path = Server.MapPath("~/PDFs");
PdfWriter.GetInstance(document, new FileStream(path + "/TestDoc2.pdf", FileMode.Create));
document.Open();
document.Add(new Phrase(this.txtTextBox1.Text.Trim()));
document.Close();
}