在C#中如何实现几种图片格式的转换

本人新手请教高手们如何用C#代码实现这几种格式的转换：DDS转换成JPG、TGA转换成JPG、JPG转换成TGA、DDS转换成TGA。求详细代码，求高手指点一下
高手都哪里去了啊 就没有一个人能把JPG转换成TGA吗，高手啊 快来吧 很急的啊

这个是一个源代码，你参考一下

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

namespace convert
{
public partial class Form1 : Form
{
Bitmap bitmap;
public Form1()
{
InitializeComponent();
}

private void buttonOpen_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "*.bmp|*.bmp";
openFileDialog.Title = "打开图像文件";
openFileDialog.Multiselect = false;
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
if (bitmap != null)
{
bitmap.Dispose();
}
string fileName = openFileDialog.FileName;
bitmap = new Bitmap(fileName);
if (bitmap.Width > bitmap.Height)
{
pictureBox.Width = panel2.Width;
pictureBox.Height = (int)((double)bitmap.Height * panel2.Width / bitmap.Width);
}
else
{
pictureBox.Height = panel2.Height;
pictureBox.Width = (int)((double)bitmap.Width * panel2.Height / bitmap.Height);
}
pictureBox.Image = bitmap;
FileInfo f = new FileInfo(fileName);
this.Text = "图像转换:" + f.Name;
this.label1.Text = f.Name;
buttonConvert.Enabled = true;
}
}

private void buttonConvert_Click(object sender, EventArgs e)
{
if (comboBox.SelectedItem == null)
{
return;
}
else
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Title = "转化为:";
saveFileDialog.OverwritePrompt = true;
saveFileDialog.CheckPathExists = true;
saveFileDialog.Filter = comboBox.Text + "|" + comboBox.Text;
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveFileDialog.FileName;
bitmap.Save(fileName, ImageFormat.Jpeg);
FileInfo f = new FileInfo(fileName);
this.Text = "图像转换:" + f.Name;
label1.Text = f.Name;
}
}
}

private void panel2_Resize(object sender, EventArgs e)
{
pictureBox.Top = panel1.Top;
pictureBox.Left = panel1.Left;
if (bitmap != null)
{
if (bitmap.Width > bitmap.Height)
{
pictureBox.Width = panel2.Width;
pictureBox.Height = (int)((double)bitmap.Height * panel2.Width / bitmap.Width);
}
else
{
pictureBox.Height = panel2.Height;
pictureBox.Width = (int)((double)bitmap.Width * panel2.Height / bitmap.Height);
}
}
else
{
pictureBox.Width = panel2.Width;
pictureBox.Height = panel2.Height;
}
pictureBox.Refresh();
}
}
}

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