C#映像格式轉換工具

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

namespace 映像格式轉換工具
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.skinEngine1.SkinFile = "MidsummerColor2.ssk";
        }
        string url = string.Empty;
        private void btnOpen_Click(object sender, EventArgs e)
        {
            this.pictureBox1.Visible = true;
            this.openFileDialog1.ShowDialog();
            url = this.openFileDialog1.FileName;
            if (url != "")
            {
                pictureBox1.Image = Image.FromFile(url);
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (url == "")
            {
                MessageBox.Show("請選擇需要轉換的圖片!","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
            }
            else
            {
                this.saveFileDialog1.ShowDialog();
                if (this.rbtnBMP.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".BMP",
                        System.Drawing.Imaging.ImageFormat.Bmp);
                }
                if (this.rbtnGIF.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".GIF",
                        System.Drawing.Imaging.ImageFormat.Gif);
                }
                if (this.rbtnJPG.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".JPG",
                        System.Drawing.Imaging.ImageFormat.Jpeg);
                }
                if (this.rbtnPNG.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".PNG",
                        System.Drawing.Imaging.ImageFormat.Png);
                }
                if (this.rbtnicon.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".icon",
                        System.Drawing.Imaging.ImageFormat.Icon);
                }
                if (this.rbtnwmf.Checked == true)
                {
                    this.pictureBox1.Image.Save(this.saveFileDialog1.FileName + ".wmf",
                        System.Drawing.Imaging.ImageFormat.Wmf);
                }
            }
        }
        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if(this.WindowState==FormWindowState.Minimized)
            {
                this.WindowState=FormWindowState.Normal;
                this.Activate();
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
        }
    }
}