An enum can be declared inside a class, struct, namespace or interface.

namespace CuriousTabConsoleApplication
( 
class Sample
{ 
    private enum color : int
    { 
        red, 
        green, 
        blue
    }
    public void fun()
    {
        Console.WriteLine(color.red); 
    }
}
class Program
{ 
    static void Main(string[ ] args)
    { 
        // Use enum color here
    } 
} 
}

1. To define a variable of type enum color in Main(), we should use the statement, color c; .
2. enum color being private it cannot be used in Main().
3. We must declare enum color as public to be able to use it outside the class Sample.
4. To define a variable of type enum color in Main(), we should use the statement, Sample.color c; .
5. We must declare private enum color outside the class to be able to use it in Main().

int a = 10; 
int b = 20; 
int c = 30;
enum color: byte
{
    red = a, 
    green = b,
    blue = c 
}

1. By default the first enumerator has the value equal to the number of elements present in the list.
2. The value of each successive enumerator is decreased by 1.
3. An enumerator contains white space in its name.
4. A variable cannot be assigned to an enum element.
5. Values of enum elements cannot be populated from a database.

1. Every enum is derived from an Object class.
2. Every enum is a value type.
3. There does not exist a way to print an element of an enum as a string.
4. Every enum is a reference type.
5. The default underlying datatype of an enum is int.

namespace College
{
    namespace Lib
    {
        class Book
        {
            public void Issue()
            {
                // Implementation code
            }
        }
        class Journal
        {
            public void Issue()
            {
                // Implementation code
            }
        }
    }
}

1. College.Lib.Book b = new College.Lib.Book(); 
   b.Issue();

2. Book b = new Book(); 
   b.Issue();

3. using College.Lib; 
   Book b = new Book(); 
   b.Issue();

4. using College;
   Lib.Book b = new Lib.Book(); 
   b.Issue();

5. using College.Lib.Book; 
   Book b = new Book(); 
   b.Issue();

namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            import n1; 
            Point x = new Point();
            x.fun();
            import n2;
            Point y = new Point(); 
            y.fun();
        }
    }
}

import n1; 
import n2;
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        {
            n1.Point x = new n1.Point(); 
            x.fun();
            n2.Point y = new n2.Point(); 
            y.fun();
        }
    }
}

namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    {
        static void Main(string[] args)
        {
            using n1;
            Point x = new Point();
            x.fun();
            using n2;
            Point y = new Point();
            y.fun();
        }
    }
}

using n1;
using n2; 
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            n1.Point x = new n1.Point(); 
            x.fun();
            n2.Point y = new n2.Point(); 
            y.fun(); 
        } 
    } 
}