trying to learn

[devilonline]

hi, i'm learning c# by this book: "Wrox beginning c sharp 3.0 an introdution...." however the code he puts there never works fine for me. for exemple i have this code: "has more than one entry point defined: "windowsFormsApllication3.Main(). compile with /main to specficy the type that contains the entry point" how can i solve this. sorry im at the begining. (how can i put the code here?)


here is the code:

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;

namespace WindowsFormsApplication3
{
    public partial class frmain : Form
    {

        private Label label1;
        private TextBox txtLongDate;
        private Label label2;
        private TextBox txtShortDate;
        private Label label3;
        private TextBox txtGeneralDateAndTime;
        private Label label4;
        private TextBox txtLongTime;
        private Label label5;
        private TextBox txtShortTime;
        private Label label6;
        private TextBox txtDaysToNewYears;
        private Label label7;
        private Button btnClose;
        private Button btnRefresh;
        private TextBox txtCompleteDateAndTime;
        #region Windows code
        #endregion

        public frmain()
        {
            InitializeComponent();
            UpdateTimeInfo(); // Update textboxes
        }

        public static void Main()
        {
            frmMain main = new frmMain();
            Application.Run(main);
        }
        private void UpdateTimeInfo()
        {
            int days;
            DateTime myTime = new DateTime();
            myTime = DateTime.Now;
            DateTime newYears = new DateTime(myTime.Year, 12, 31);
            txtCompleteDateAndTime.Text = myTime.ToString("f");
            txtLongDate.Text = myTime.ToString("D");
            txtShortDate.Text = myTime.ToString("d");
            txtGeneralDateAndTime.Text = myTime.ToString("g");
            txtLongTime.Text = myTime.ToString("T");
            txtShortTime.Text = myTime.ToString("t");
            days = newYears.DayOfYear - myTime.DayOfYear;
            txtDaysToNewYears.Text = days.ToString();

        }
        private void btnRefresh_Click(object sender, EventArgs e)
        {
            UpdateTimeInfo();
        }
        private void btnClose_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}

thanks