Traffic Light

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace _11주차_신호등과움짤만들기_김인태
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public void ChangeSinhodoong(int Color) // 우리가 직접 만든 자작 함수 프로시저
        {
            switch (Color)
            {
                case 0:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory 
                        + "/사진모음/신호등/신호등(준비중).png");
                    break;
                case 1:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(적색).png");
                    break;
                case 2:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(노란색).png");
                    break;
                case 3:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(녹색).png");
                    break;
            }
        }

        int Color = 1; // 전역 변수
        private void timer1_Tick(object sender, EventArgs e)
        {
            ChangeSinhodoong(Color);
            Color++;
            if (Color >= 4) Color = 1;

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ChangeSinhodoong(0);
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace _11주차_신호등과움짤만들기_김인태
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public void ChangeSinhodoong(int Color) // 우리가 직접 만든 자작 함수 프로시저
        {
            switch (Color)
            {
                case 0:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory 
                        + "/사진모음/신호등/신호등(준비중).png");
                    break;
                case 1:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(적색).png");
                    break;
                case 2:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(노란색).png");
                    break;
                case 3:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(녹색).png");
                    break;
                case 4:
                    pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/신호등(노란색).png");
                    break;
            }
        }

        int Color = 1; // 전역 변수
        private void timer1_Tick(object sender, EventArgs e)
        {
            ChangeSinhodoong(Color);
            Color++;
            if (Color >= 5) Color = 1;

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ChangeSinhodoong(0);
        }

    }
}

Form 2 - 코드를 짧게 만들었음

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace _11주차_신호등과움짤만들기_김인태
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        int Color = 0;
        private void timer1_Tick(object sender, EventArgs e)
        {
            pictureBox1.Image = Image.FromFile(System.Environment.CurrentDirectory
                        + "/사진모음/신호등/"+Color+".png");
            Color++;
            if (Color == 5) Color = 1;
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }
    }
}