How to add page border in microsoft word in programmatically

using System.Drawing;
using Spire.Doc;
using Spire.Doc.Documents;

namespace WordBorder
{
    class PageBorders
    {
        static void Main(string[] args)
        {
            //Load Document
            Document document = new Document();
            document.LoadFromFile(@"E:\Work\Documents\Microsoft Word 2013 Preview.docx");
            Section section = document.Sections[0];

            //Add Page Borders with Special Style and Color
            section.PageSetup.Borders.BorderType = BorderStyle.DoubleWave;
            section.PageSetup.Borders.Color = Color.LightSeaGreen;
            //Space between Border and Text
            section.PageSetup.Borders.Left.Space = 50;
            section.PageSetup.Borders.Right.Space = 50;

            //Save and Launch
            document.SaveToFile("PageBorders.docx", FileFormat.Docx);
            System.Diagnostics.Process.Start("PageBorders.docx");
        }
    }
}
Note: This method is based on a C# Word component, you need to add its dll before running this sample code.Good luck.