[Create a class named Square that contains fields]

Here is the code for the classes Square and DemoSquares:

using System;

public class Square
{
    private double side;
    private double area;

    public double Side
    {
        get { return side; }
    }

    public double Area
    {
        get { return area; }
    }

    public Square(double sideLength)
    {
        side = sideLength;
        CalculateArea();
    }

    private void CalculateArea()
    {
        area = side * side;
    }
}

public class DemoSquares
{
    public static void Main(string[] args)
    {
        Square[] squares = new Square[10];

        for (int i = 0; i < squares.Length; i++)
        {
            squares[i] = new Square(i + 1);
        }

        foreach (Square square in squares)
        {
            Console.WriteLine("Side: {0}, Area: {1}", square.Side, square.Area);
        }
    }
}

In the Square class, there are private fields side and area, representing the length of a side and the area of the square respectively. The constructor takes a parameter for the length of one side of the square, assigns it to the side field, and then calls the CalculateArea() method to compute the area. The Side and Area properties are read-only properties that allow external access to the values of side and area.

The DemoSquares class is where the actual demonstration of the Square class takes place. It instantiates an array of ten Square objects, with side lengths ranging from 1 to 10. Then, it iterates over the array and displays the values for each square, including its side length and area.

Note that you need to save the DemoSquares class as DemoSquares.cs for it to compile and run as a standalone program.

using System;

public class Square
{
    private double side;
    private double area;

    public Square(double sideLength)
    {
        side = sideLength;
        CalculateArea();
    }

    private void CalculateArea()
    {
        area = side * side;
    }

    public double Side
    {
        get { return side; }
    }

    public double Area
    {
        get { return area; }
    }
}

public class DemoSquares
{
    public static void Main(string[] args)
    {
        Square[] squares = new Square[10];

        // Instantiate Square objects with sides from 1 to 10
        for (int i = 0; i < squares.Length; i++)
        {
            double sideLength = i + 1; // Sides range from 1 to 10
            squares[i] = new Square(sideLength);
        }

        // Display the values for each Square
        Console.WriteLine("Squares:");
        for (int i = 0; i < squares.Length; i++)
        {
            Console.WriteLine($"Side: {squares[i].Side}, Area: {squares[i].Area}");
        }
    }
}