C# Resize image

public void ResizeImage(string OriginalFile, string NewFile, int NewWidth, int MaxHeight, bool OnlyResizeIfWider)
{
 System.Drawing.Image FullsizeImage = System.Drawing.Image.FromFile(OriginalFile);

 // Prevent using images internal thumbnail
 FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
 FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);

 if (OnlyResizeIfWider)
 {
  if (FullsizeImage.Width <= NewWidth)
  {
   NewWidth = FullsizeImage.Width;
  }
 }

 int NewHeight = FullsizeImage.Height * NewWidth / FullsizeImage.Width;
 if (NewHeight > MaxHeight)
 {
  // Resize with height instead
  NewWidth = FullsizeImage.Width * MaxHeight / FullsizeImage.Height;
  NewHeight = MaxHeight;
 }

 System.Drawing.Image NewImage = FullsizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero);

 // Clear handle to original file so that we can overwrite it if necessary
 FullsizeImage.Dispose();

 // Save resized picture
 NewImage.Save(NewFile);
}

Resources
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C#: Resize An Image While Maintaining Aspect Ratio and Maximum Height

http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing