image size - Reducing image size to a particular height and resolution

using System;

class Program
{
	static void Main(string[] args)
	{
		Resize(@"C:\input.jpg", @"c:\output.jpg");
	}


	private static void Resize(string inputPath, string outputPath)
	{
		float dpi = 120f;
		//5 inch * 120 dots per inch
		int size = (int)(5f * dpi);

		using (var bitmap = new Aurigma.GraphicsMill.Bitmap(inputPath))
		{
			if (bitmap.Width < bitmap.Height)
			{
				//Set value of height param to 0, so it is calculated based on width paranm
				bitmap.Transforms.Resize(size, 0, Aurigma.GraphicsMill.Transforms.ResizeInterpolationMode.High);
			}
			else
			{
				//Set value of width param to 0, so it is calculated based on height paranm
				bitmap.Transforms.Resize(0, size, Aurigma.GraphicsMill.Transforms.ResizeInterpolationMode.High);
			}

			//Set dpi
			bitmap.DpiX = dpi;
			bitmap.DpiY = dpi;

			bitmap.Save(outputPath);
		}
	}
}