convertir imagenes c#(código), convert images c#

Elementos del formulario;

Código del programa;

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 System.IO;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        List<string> list = new List<string>();

        string res="";

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            this.Opacity = 0.95;

            label1.Text = "";

            button2.Enabled = false;

           

        }

        private void button1_Click(object sender, EventArgs e)

        {

            listBox1.Items.Clear();

            list.Clear();

            openFileDialog1.Multiselect = true;

            openFileDialog1.Filter = "Bmp image(*.bmp)|*.bmp|" + "Jpg image(*.jpg)|*.jpg|" + "Png image(*.png)|*.png|" +

                "Gif image(*.gif)|*.gif|" + "Emf image(*.emf)|*.emf|" + "Exif image(*.exif)|*.exif|" + "Icon image(*.ico)|*.ico|" +

                "Wmf image(*.wmf)|*.wmf|" + "Tiff image(*.tiff)|*.tiff|" + "All Files(*.*)|*.*";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                string[] info = openFileDialog1.FileNames;

                foreach (string s in info)

                {

                    listBox1.Items.Add(Path.GetFileName(s));

                    list.Add(s);

                }

            }

          

        }

        private void button2_Click(object sender, EventArgs e)

        {

             string str="";

             int f = 0;

             if (comboBox1.SelectedIndex >= 0)

             {

                 str = comboBox1.Items[comboBox1.SelectedIndex].ToString();

                 string path = "";

                 foreach (string s in list)

                 {

                     Image img = Image.FromFile(@s);

                     path = res + "\\" + Path.GetFileNameWithoutExtension(s) + "." + str.ToLower();

                     switch (str)

                     {

                         case "Bmp":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Bmp);

                             break;

                         case "Jpg":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Jpeg);

                             break;

                         case "Gif":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Gif);

                             break;

                         case "Png":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Png);

                             break;

                         case "Emf":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Emf);

                             break;

                         case "Exif":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Exif);

                             break;

                         case "Ico":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Icon);

                             break;

                         case "Wmf":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Wmf);

                             break;

                         case "Tiff":

                             img.Save(@path, System.Drawing.Imaging.ImageFormat.Tiff);

                             break;

                     }

                     f++;

                 }

                 label1.Text = f.ToString() + " imagenes convertidas !!!";

             }

             else

             {

                 MessageBox.Show("selecciona la salida de formato !", "*** error ***", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                 comboBox1.Select();

                 comboBox1.Focus();

             }

            

               

               

        }

        private void button3_Click(object sender, EventArgs e)

        {

            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)

            {

                res = folderBrowserDialog1.SelectedPath;

            }

            button2.Enabled = true;

           

        }

        private void button5_Click(object sender, EventArgs e)

        {

            Application.Exit();

        }

     

    }

}