using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Xml.Serialization;
using System.Web.Services.Protocols;
using System.Web.Services;

namespace HelloWorldApp
{
	class HelloWorld
	{
		[STAThread]
		static void Main()
		{
			Application.Run(new HWForm());
		}
	} // HelloWorld

	public class HWForm : Form
	{
		private Button 	btnExit;
		private Button 	btnCallHW;
		private Label 	lblHW;

		public HWForm()
		{
			btnExit = new System.Windows.Forms.Button();
			btnExit.Location = new System.Drawing.Point(102, 83);
			btnExit.Size = new System.Drawing.Size(100, 23);
			btnExit.Text = "Exit";
			btnExit.Click += new System.EventHandler(btnExit_Click);

			btnCallHW = new System.Windows.Forms.Button();
			btnCallHW.Location = new System.Drawing.Point(102, 113);
			btnCallHW.Size = new System.Drawing.Size(100, 23);
			btnCallHW.Text = "Call Webservice HW";
			btnCallHW.Click += new System.EventHandler(btnCallHW_Click);

			lblHW		= new System.Windows.Forms.Label();
			lblHW.AutoSize 	= true;
			lblHW.Location 	= new System.Drawing.Point(99, 32);
			lblHW.Text 	= "Hello World!!";

			ClientSize = new System.Drawing.Size(384, 165);
			Controls.Add(this.lblHW);
			Controls.Add(this.btnExit);
			Controls.Add(this.btnCallHW);
			Text = "Hello world !!";
		}

		private void btnExit_Click(object sender, EventArgs e)
		{
			Application.Exit();
		}

		private void btnCallHW_Click(object sender, EventArgs e)
		{
			HelloWorldWS ws = new HelloWorldWS();
			Text = "Received : '"+ ws.HelloWorld() +"' from Webservice";
		}
	} // HWForm

	[System.Web.Services.WebServiceBindingAttribute(Name="Service1Soap", Namespace="http://clan35.learns.dotnet/")]
	public class HelloWorldWS : System.Web.Services.Protocols.SoapHttpClientProtocol 
	{
    
		public HelloWorldWS() 
		{
			this.Url = "http://localhost/wshelloworld/helloworld.asmx";
		}
    
    		[System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://clan35.learns.dotnet/HelloWorld", RequestNamespace="http://clan35.learns.dotnet/", ResponseNamespace="http://clan35.learns.dotnet/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
		public string HelloWorld() 
		{
			object[] results = this.Invoke("HelloWorld", new object[0]);
			return ((string)(results[0]));
		}
	}	// HelloWorldWS
}

using System;

namespace HelloWorldApp
{
    public class HelloWorldClass
    {
        public HelloWorldClass()
        {
        }
        public void SayIt()
        {
            Console.WriteLine("Hello world !!!");
        }
    }
}

namespace HelloWorldApp
{
    class HWMain
    {
        static void Main()
        {
            HelloWorldClass hw = new HelloWorldClass();
            hw.SayIt();
        }
    }
}

using System;
using System.Windows.Forms;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics;
using System.ServiceProcess;
using System.Configuration.Install;

namespace HelloWorldApp
{
	public class HelloWorldSvc : System.ServiceProcess.ServiceBase
	{
		private System.Timers.Timer timer;

		public HelloWorldSvc()
		{
			timer = new System.Timers.Timer();
			timer.Interval = 10000;  // Gør noget hver t 10. sekund
			timer.Elapsed += new System.Timers.ElapsedEventHandler(this.timer_Elapsed);

			CanPauseAndContinue = true;
			CanShutdown = true;
			ServiceName = "HelloWorld_Service";

			timer.Enabled = true;
			timer.Start();
		}

		static void Main()
		{
			System.ServiceProcess.ServiceBase[] ServicesToRun;

			ServicesToRun = new System.ServiceProcess.ServiceBase[] { new HelloWorldSvc() };

			System.ServiceProcess.ServiceBase.Run(ServicesToRun);
		}

		protected override void OnStart(string[] args)
		{
			timer.Start();
		}

		protected override void OnPause()
		{
			timer.Stop();
		}

		protected override void OnContinue()
		{
			timer.Start();
		}

		protected override void OnStop()
		{
			timer.Stop();
		}

		private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
		{
			EventLog.WriteEntry("C# gets the job done on: " + System.Environment.MachineName);
		}
	}

	[RunInstaller(true)]
	public class ProjectInstaller : System.Configuration.Install.Installer
	{
		private System.ServiceProcess.ServiceProcessInstaller serviceProcessInstaller;
		private System.ServiceProcess.ServiceInstaller serviceInstaller;

		public ProjectInstaller()
		{
			serviceProcessInstaller = new System.ServiceProcess.ServiceProcessInstaller();
			serviceProcessInstaller.Account = ServiceAccount.LocalSystem;
			
			serviceInstaller = new System.ServiceProcess.ServiceInstaller();
			serviceInstaller.StartType = ServiceStartMode.Automatic;
			serviceInstaller.ServiceName = "HelloWorld_Service";
			serviceInstaller.AfterInstall += new System.Configuration.Install.InstallEventHandler(this.serviceInstaller_AfterInstall);

			Installers.AddRange(new System.Configuration.Install.Installer[] { serviceProcessInstaller, serviceInstaller });
		}

		private void serviceInstaller_AfterInstall(object sender, System.Configuration.Install.InstallEventArgs e)
		{
			MessageBox.Show(serviceInstaller.ServiceName + " succesfully installed...");
		}
	}
}

installutil hwservice.exe

installutil /uninstall hwservice.exe
installutil /u hwservice.exe

net start "HelloWorld_Service"

net stop "HelloWorld_Service"