in c # i need to  Create an application named TurningDemo that creates instances of four classes: Page, Corner, Pancake, and Leaf. Create an interface named ITurnable that contains a single method named Turn(). The classes named Page, Corner, Pancake, and Leaf implement ITurnable. Create each class’s Turn() method to display an appropriate message. For example: The Page’s Turn() method should display You turn a page in a book. The Corner’s Turn() method should display You turn corners to go around the block. The Pancake's Turn() method should display You turn a pancake when it's done on one side. The Leaf's Turn() method should display A leaf turns colors in the fall. i keep getting errors  Unit TestIncomplete Page class defined Build Status Build Failed Build Output Compilation failed: 3 error(s), 0 warnings NtTest3c897a9a.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive? NtTest3c897a9a.cs(23,7): error CS0246: The type or namespace name `Page' could not be found. Are you missing `TurningDemo' using directive? NtTest3c897a9a.cs(24,7): error CS0841: A local variable `page' cannot be used before it is declared Unit TestIncomplete Leaf class defined Build Status Build Failed Build Output Compilation failed: 3 error(s), 0 warnings NtTestedfb3216.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive? NtTestedfb3216.cs(23,7): error CS0246: The type or namespace name `Leaf' could not be found. Are you missing `TurningDemo' using directive? NtTestedfb3216.cs(24,7): error CS0841: A local variable `leaf' cannot be used before it is declared Unit TestIncomplete Pancake class defined Build Status Build Failed Build Output Compilation failed: 3 error(s), 0 warnings NtTestd679fa4e.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive? NtTestd679fa4e.cs(23,7): error CS0246: The type or namespace name `Pancake' could not be found. Are you missing `TurningDemo' using directive? NtTestd679fa4e.cs(24,7): error CS0841: A local variable `pancake' cannot be used before it is declared Unit TestIncomplete Corner class defined Build Status Build Failed Build Output Compilation failed: 3 error(s), 0 warnings NtTest0922cef6.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive? NtTest0922cef6.cs(23,7): error CS0246: The type or namespace name `Corner' could not be found. Are you missing `TurningDemo' using directive? NtTest0922cef6.cs(24,7): error CS0841: A local variable `corner' cannot be used before it is declared my code is  using System; namespace TurningDemo {     public interface ITurnable     {         void Turn();     }     public class Page : ITurnable     {         public void Turn()         {             Console.WriteLine("You turn a page in a book.");         }     }     public class Leaf : ITurnable     {         public void Turn()         {             Console.WriteLine("A leaf turns colors in the fall.");         }     }     public class Pancake : ITurnable     {         public void Turn()         {             Console.WriteLine("You turn a pancake when it's done on one side.");         }     }     public class Corner : ITurnable     {         public void Turn()         {             Console.WriteLine("You turn corners to go around the block.");         }     }     class Program     {         static void Main(string[] args)         {             ITurnable page = new Page();             page.Turn();             ITurnable leaf = new Leaf();             leaf.Turn();             ITurnable pancake = new Pancake();             pancake.Turn();             ITurnable corner = new Corner();             corner.Turn();         }     } }

Microsoft Visual C#
7th Edition
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Joyce, Farrell.
Chapter10: Introduction To Inheritance
Section: Chapter Questions
Problem 8E: Create an application named TurningDemo that creates instances of four classes: Page, Corner,...
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in c # i need to 

Create an application named TurningDemo that creates instances of four classes: Page, Corner, Pancake, and Leaf.

Create an interface named ITurnable that contains a single method named Turn(). The classes named Page, Corner, Pancake, and Leaf implement ITurnable.

Create each class’s Turn() method to display an appropriate message. For example:

  • The Page’s Turn() method should display You turn a page in a book.
  • The Corner’s Turn() method should display You turn corners to go around the block.
  • The Pancake's Turn() method should display You turn a pancake when it's done on one side.
  • The Leaf's Turn() method should display A leaf turns colors in the fall.

i keep getting errors 

Unit TestIncomplete
Page class defined

Build Status
Build Failed
Build Output
Compilation failed: 3 error(s), 0 warnings

NtTest3c897a9a.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive?
NtTest3c897a9a.cs(23,7): error CS0246: The type or namespace name `Page' could not be found. Are you missing `TurningDemo' using directive?
NtTest3c897a9a.cs(24,7): error CS0841: A local variable `page' cannot be used before it is declared

Unit TestIncomplete
Leaf class defined

Build Status
Build Failed
Build Output
Compilation failed: 3 error(s), 0 warnings

NtTestedfb3216.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive?
NtTestedfb3216.cs(23,7): error CS0246: The type or namespace name `Leaf' could not be found. Are you missing `TurningDemo' using directive?
NtTestedfb3216.cs(24,7): error CS0841: A local variable `leaf' cannot be used before it is declared

Unit TestIncomplete
Pancake class defined

Build Status
Build Failed
Build Output
Compilation failed: 3 error(s), 0 warnings

NtTestd679fa4e.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive?
NtTestd679fa4e.cs(23,7): error CS0246: The type or namespace name `Pancake' could not be found. Are you missing `TurningDemo' using directive?
NtTestd679fa4e.cs(24,7): error CS0841: A local variable `pancake' cannot be used before it is declared

Unit TestIncomplete
Corner class defined

Build Status
Build Failed
Build Output
Compilation failed: 3 error(s), 0 warnings

NtTest0922cef6.cs(12,26): error CS0246: The type or namespace name `ITurnable' could not be found. Are you missing `TurningDemo' using directive?
NtTest0922cef6.cs(23,7): error CS0246: The type or namespace name `Corner' could not be found. Are you missing `TurningDemo' using directive?
NtTest0922cef6.cs(24,7): error CS0841: A local variable `corner' cannot be used before it is declared

my code is 

using System;

namespace TurningDemo
{
    public interface ITurnable
    {
        void Turn();
    }

    public class Page : ITurnable
    {
        public void Turn()
        {
            Console.WriteLine("You turn a page in a book.");
        }
    }

    public class Leaf : ITurnable
    {
        public void Turn()
        {
            Console.WriteLine("A leaf turns colors in the fall.");
        }
    }

    public class Pancake : ITurnable
    {
        public void Turn()
        {
            Console.WriteLine("You turn a pancake when it's done on one side.");
        }
    }

    public class Corner : ITurnable
    {
        public void Turn()
        {
            Console.WriteLine("You turn corners to go around the block.");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ITurnable page = new Page();
            page.Turn();

            ITurnable leaf = new Leaf();
            leaf.Turn();

            ITurnable pancake = new Pancake();
            pancake.Turn();

            ITurnable corner = new Corner();
            corner.Turn();
        }
    }
}

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