Package.cs

public class Package {
    private double Height, Length, Width, weight;
    private bool air = false;

    public double Height
    {
        get { return Height; }
        set { Height = value; }
    }
    public double Length
    {
        get { return Length; }
        set { Length= value; }
    }

    public double Width
    {
        get { return Width; }
        set { Width = value; }
    }

    public double Weight
    {
        get { return Weight; }
        set { Weight = value; }
    }

    public Package(){
       height = 0;
       length = 0;
       width = 0;
       weight = 0;
    }
    public Package(float height, float length, float width, float weight, bool air){
        this.height = height;
        this.length = length;
        this.width = width;
        this.weight = weight;
        this.air = air;
    }

    public Package setShippingMethodToLand() {
        this.air = false;
        return this;
    }
    public Package setShippingMethodToAir(){
       this.air = true;
       return this;
     }
    public float getPrice();

        public double getPerimeter()
        {
            return (2 * length) + (2 * width);
        }

        public double getVolume()
        {
            return height * width * length;
        }

public double Surcharges()
        {
            double total = 0;
            const double FLAT_RATE = 4.95, SM_WEIGHT = 3.95, MD_WEIGHT = 6.95, LG_WEIGHT = 9.95, LG_VOL = 5.95, LG_PERIMETER = 3.95, AIR_SHIP = 9.95;

            total += FLAT_RATE;

            if (weight >= 10 && weight < 15)
            {
                total += SM_WEIGHT;
            }
                else if (weight >= 15 && weight <= 20 )
                {
                    total += MD_WEIGHT;
                }
                    else if (weight >= 20 && weight <= 25 )
                    {
                        total += LG_WEIGHT;
                    }

            if (volume > 4800)
            {
                total += LG_VOL;
            }

            if (perimeter > 130)
	        {
		         total += LG_PERIMETER;
	        }

            if (air == true)
            {
                total += AIR_SHIP;
            }

            return total;
        }
        
    }
}

ShippingRateCalculator.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ShippingRateCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            int numPackages;
            //double total = 0, extraCharges = 0;
            string shippingType;


            //Some of these things I am not sure how to write into methods. I also think some of the methods are really cluttered and could be written better, but I'm not sure how. 
            //Do not know how to write a restraint method. Have not written the summary stuff yet, since I think it will change when I talk to you


            Console.WriteLine("How many packages would you like to ship?");
            numPackages = Convert.ToInt32(Console.ReadLine());

           Package[] packages = new Packages[numPackages];
           
            for(int i = 0; i < packages.length; i++){
                Package package = packages[i];
                
            Console.WriteLine("What is the height of the package?");
            package.setHeight(Convert.ToDouble(Console.ReadLine()));

            Console.WriteLine("What is the length of the package?");
            package.setLength = (Convert.ToDouble(Console.ReadLine()));

            Console.WriteLine("What is the width of the package?");
            packageWidth = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("How much does the package weigh?");
            packageWeight = Convert.ToDouble(Console.ReadLine());
            }

            //Package information. Do not know how to do this in a method. Was thinking it would be ok with a for loop, but I can't think of a way to write it.

            
           
            //Shipping information

            Console.WriteLine("Is this package being sent by air or land?");
            shippingType = Console.ReadLine();
            if (shippingType == "air")
	        {
		      air = true;
	        }

            //Dimension methods

            packagePerimeter = Perimeter(packageLength, packageWidth);
            packageVolume = Volume(packageHeight, packageWidth, packageLength);

            //Surcharge method
            extraCharges = Surcharges(packageWeight, packageVolume, packagePerimeter, air);

            total += extraCharges;


          
        }

        
}