how to hide PDF Table Border

Question

i am creating pdf table using i textsharp.

now i dont know how to hide table border.

 here my code to generate pdf table

 

Document document = new Document(PageSize.A4, 10, 10, 10, 10);

PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("test1.pdf", FileMode.Create));

document.Open();

iTextSharp.text.Font font = new iTextSharp.text.Font();

font.Color = iTextSharp.text.BaseColor.WHITE;

PdfPTable table = new PdfPTable(3);

PdfPCell cell = new PdfPCell(new Phrase("NEW PDF", font));

cell.Colspan = 3;

cell.BackgroundColor = new iTextSharp.text.BaseColor(17, 99, 172);

cell.HorizontalAlignment = Element.ALIGN_CENTER;

table.AddCell(cell);

table.AddCell("Row 2, Col 1");

table.AddCell("Row 2, Col 1");

table.AddCell("Row 2, Col 1");

table.AddCell("Row 3, Col 1");

cell = new PdfPCell(new Phrase("Row 3, Col 2 and Col3"));

cell.Colspan = 2;

table.AddCell(cell);

cell = new PdfPCell(new Phrase("Row 4, Col 1 and Col2"));

cell.Colspan = 2;

table.AddCell(cell);

table.AddCell("Row 4, Col 3");

document.Add(table);

document.Close();