Programatically adding a document to a document library.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.SharePoint;
using System.IO;

namespace FileUploadinSharePoint
{

    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnUpload_Click(object sender, EventArgs e)
        {

            string filename = txtUpload.Text;

            SPSite _MySite = new SPSite("http://agmsm:9999/");

            SPWeb _MyWeb = _MySite.OpenWeb();

            FileStream fstream = File.OpenRead(txtUpload.Text);

            byte[] content = new byte[fstream.Length];

            fstream.Read(content, 0, (int)fstream.Length);

            fstream.Close();

            _MyWeb.Files.Add("http://agmsm:9999/My%20Documents/uploadedfromcode.doc", content);

            MessageBox.Show("File Saved  to name called uploadedfromcode");

        }
    }
}