C#

Client:

       static void Main(string[] args)
        {
            Console.Write("\nPlease enter the URI to post data to : ");
            String uriString = Console.ReadLine();

            WebClient myWebClient = new WebClient();

            Console.WriteLine("\nPlease enter the fully qualified path of the file to be uploaded to the URI");
            string fileName = Console.ReadLine();
            Console.WriteLine("Uploading {0} to {1} ...", fileName, uriString);

            DateTime begin = DateTime.Now;

            byte[] responseArray = null;
            try
            {
                responseArray = myWebClient.UploadFile(uriString, fileName);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.ToString());
            }

            DateTime end = DateTime.Now;

            Console.WriteLine("Elapsed time is: {0}", (end - begin).TotalMilliseconds);
        }

Server:

    public partial class FileUploadHandler : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            foreach (string f in Request.Files.AllKeys)
            {
                HttpPostedFile file = Request.Files[f];
                file.SaveAs("D:\\UploadFile\\UploadedFiles\\" + file.FileName);
            }
        }
    }

Exception from client side:

Unable to connect to the remote server
System.Net.WebException: Unable to connect to the remote server ---> System.Net.
Sockets.SocketException: No connection could be made because the target machine
actively refused it 10.10.12.162:1031
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddre
ss socketAddress)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Sock
et s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state,
IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.WebClient.UploadFile(Uri address, String method, String fileNam
e)
   at FileUploadClient.Program.Main(String[] args) in D:\UploadFile\FileUploadClient\Program.cs:line 30

<br />
-Class<br />
<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Linq;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.HtmlControls;<br />
using System.Web.UI.WebControls;<br />
using System.Web.UI.WebControls.WebParts;<br />
using System.Xml.Linq;<br />
using System.Web.Services;<br />
using System.Data.SqlClient;<br />
<br />
/// <summary><br />
/// Summary description for MyClass<br />
/// </summary><br />
public class MyClass<br />
{<br />
	public MyClass()<br />
	{<br />
		//<br />
		// TODO: Add constructor logic here<br />
		//<br />
	}<br />
<br />
<br />
<br />
   <br />
    public static string [] GetCountry(string country)<br />
    {<br />
<br />
        string query = "SELECT DISTINCT COUNTRY FROM CUSTOMERS WHERE COUNTRY LIKE @Country";<br />
        using (SqlConnection conn = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\NORTHWIND.MDF;Integrated Security=True;User Instance=True"))<br />
        {<br />
           <br />
            SqlDataAdapter adapter = new SqlDataAdapter(query, conn);<br />
            adapter.SelectCommand.Parameters.Add("@Country", SqlDbType.VarChar, 15).Value = country + "%";<br />
            DataTable dt = new DataTable();<br />
            adapter.Fill(dt);<br />
            string[] items = new string[dt.Rows.Count];<br />
            int i = 0;<br />
             foreach (DataRow dr in dt.Rows)<br />
            {<br />
                items.SetValue(dr["Country"].ToString(), i);<br />
               <br />
                i++;<br />
            }<br />
            return items;<br />
           <br />
<br />
            <br />
<br />
        }<br />
    }<br />
}<br />
<br />
<br />
-Web Method<br />
<br />
using System;<br />
using System.Collections;<br />
using System.Linq;<br />
using System.Web;<br />
using System.Web.Services;<br />
using System.Web.Services.Protocols;<br />
using System.Xml.Linq;<br />
<br />
/// <summary><br />
/// Summary description for WebService<br />
/// </summary><br />
[WebService(Namespace = "http://tempuri.org/")]<br />
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]<br />
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. <br />
[System.Web.Script.Services.ScriptService]<br />
public class WebService : System.Web.Services.WebService {<br />
<br />
    public WebService () {<br />
<br />
        //Uncomment the following line if using designed components <br />
        //InitializeComponent(); <br />
    }<br />
<br />
    [System.Web.Services.WebMethod]<br />
    [System.Web.Script.Services.ScriptMethod]<br />
<br />
    public string [] GetMyCountry(string country)<br />
    {<br />
<br />
        return MyClass.GetCountry(country).ToArray();<br />
        <br />
<br />
    }<br />
    <br />
}<br />
<br />
- Source Code<br />
<br />
<![CDATA[<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>]]><br />
<br />
<![CDATA[<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>]]><br />
<br />
<br />
<br />
<html xmlns="http://www.w3.org/1999/xhtml"><br />
<head runat="server"><br />
    <title>Untitled Page</title><br />
    <style type="text/css"><br />
        .style1<br />
        {<br />
            width: 170px;<br />
        }<br />
    </style><br />
</head><br />
<body><br />
    <form id="form1" runat="server"><br />
    <div><br />
    <br />
        <table style="width: 100%; height: 161px;"><br />
            <tr><br />
                <td class="style1"><br />
                     </td><br />
                <td><br />
                     </td><br />
                <td><br />
                     </td><br />
            </tr><br />
            <tr><br />
                <td class="style1"><br />
                    Choose a Country</td><br />
                <td><br />
                    <asp:textbox id="TextBox1" runat="server" xmlns:asp="#unknown"></asp:textbox><br />
                </td><br />
                <td><br />
                     </td><br />
            </tr><br />
            <tr><br />
                <td class="style1"><br />
<cc1:autocompleteextender id="AutoCompleteExtender1" runat="server" targetcontrolid="Textbox1" servicepath="WebService.asmx" servicemethod="GetMyCountry" minimumprefixlength="1" completionsetcount="12" enablecaching="true" xmlns:cc1="#unknown"></cc1:autocompleteextender></td><br />
                <td><br />
                    <asp:scriptmanager id="ScriptManager1" runat="server" xmlns:asp="#unknown"><br />
                    <services><br />
                    <asp:servicereference path="WebService.asmx" /><br />
                    </services><br />
                    </asp:scriptmanager><br />
                </td><br />
                <td><br />
                     </td><br />
            </tr><br />
        </table><br />
    <br />
    </div><br />
    </form><br />
</body><br />
</html><br />
<br />
<br />