1. //program to demonstrate example of class student that contains two public member functions getdata() and showdata() and four data members (rollno,name,clas and marks)

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

namespace ConsoleApplication1
{
    class student
    {
        private int rollno;
        private string name;
        private int marks;
        private int clas;
        public void getdata()
        {
            rollno = 1;
            name = "abcdef";
            marks = 80;
            clas = 11;
        }
        public void showdata()
	{
		Console.WriteLine("rollno of the student is " + rollno);
		Console.WriteLine("name of student is " + name);
		Console.WriteLine("marks of student are " + marks);
        Console.WriteLine("class of student is " + clas);
	}
    }
    class Program
    {
        static void Main(string[] args)
        {
            student ob = new student();
            ob.getdata();
            ob.showdata();
            Console.ReadLine();
        }
    }
}

2. //program to demonstrate example of class employee that contains two public member functions getdata() and showdata() and four data members (ecode,name,salary and designation)

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

namespace ConsoleApplication1
{
    class employee
    {
        private int ecode;
        private String name;
        private float salary;
        private String designation;
        public void getdata()
        {
            ecode = 1;
            name = "abcdef";
            salary = 10000;
            designation = "Employee";

        }
        public void showdata()
	{
		Console.WriteLine("employee code is " + ecode);
		Console.WriteLine("name of employee is " + name);
		Console.WriteLine("salary of employee is " + salary);
        Console.WriteLine("designation of employee is " + designation);
	}
    }
    class Program
    {
        static void Main(string[] args)
        {
            employee ob = new employee();
            ob.getdata();
            ob.showdata();
            Console.ReadLine();
        }
    }
}

3. //program to demonstrate example of class book that contains two public member functions getdata() and showdata() and four data members (bookid,name,price and author)

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

namespace ConsoleApplication1
{
    class book
    {
        private int bookid;
        private String name;
        private float price;
        private String author;
        public void getdata()
        {
            bookid = 1;
            name = "abcdef";
            price = 300;
            author = "abcxyz";
        }
        public void showdata()
	{
		Console.WriteLine("book id is " + bookid);
		Console.WriteLine("book name is " + name);
		Console.WriteLine("price of book is " + price);
		Console.WriteLine("author of the book is " + author);
	}
    };
    class Program
    {
        static void Main(string[] args)
        {
            book ob = new book();
            ob.getdata();
            ob.showdata();
            Console.ReadLine();
        }
    }
}

4. //program to create a class box with data members (width,depth and height) and member functions (getdata,showdata and volume)(volume member function calculates the volume of the box )

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

namespace ConsoleApplication1
{
        class box
        {
            private int width;
            private int depth;
            private int height;
            public void getdata()
            {
                width = 10;
                depth = 20;
                height = 30;
            }
            public void volume()
	    {
		    int vol;
		    vol=width*depth*height;
		    Console.WriteLine("volume of box is " + vol);
	    }
            public void showdata()
	    {
		    Console.WriteLine("width of box is "+ width);
		    Console.WriteLine("depth of box is " + depth);
            Console.WriteLine("height of box is " + height);
	    }
        };
    class Program
    {
        static void Main(string[] args)
        {
            box ob = new box();
            ob.getdata();
            ob.showdata();
            ob.volume();
            Console.ReadLine();
        }
    }
}

5. //program to demonstrate example of class employee with data members as ecode,ename,designation,basic,hra,da and total) calculate total function calculates the total salary as sum of basic,da and hra , getdata function inputs data from user and showdata member function displays data 


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

namespace ConsoleApplication1
{
    class employeesal
    {
        private int ecode;
        private String ename;
        private float basic;
        private float da;
        private float hra;
        private float total;
        private String designation;

        public void getdata()
        {
            ecode = 1;
            ename = "abcdef";
            designation = "employee";
            basic = 10000;
            da = 3000;
            hra = 2000;

        }
        public void calculatetotal()
        {
            total = basic + da + hra;
        }
        public void showdata()
        {
	        Console.WriteLine("employee code is " + ecode);
	        Console.WriteLine("employee name is " + ename);
	        Console.WriteLine("employee designation is " + designation);
            Console.WriteLine("total salary (basic+da+hra) is " + total);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            employeesal ob = new employeesal();
            ob.getdata();
            ob.calculatetotal();
            ob.showdata();
            Console.ReadLine();
        }
    }
}

6. //program to demonstrate a class studentone which has a parameterized method

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

namespace ConsoleApplication1
{
    class studentone
    {
        private int rollno;
        private String name;
        private int marks;
        private int clas;
        public void getdata(int rno, String n, int m, int cl)
        {
            rollno = rno;
            name = n;
            marks = m;
            clas = cl;
        }
        public void showdata()
	{
		Console.WriteLine("rollno of the student is " + rollno);
		Console.WriteLine("name of student is " + name);
		Console.WriteLine("marks of student are " + marks);
        Console.WriteLine("class of student is " + clas);
	}
    }
    class Program
    {
        static void Main(string[] args)
        {
            studentone ob = new studentone();
            ob.getdata(1, "abcdef", 80, 11);
            ob.showdata();
            Console.ReadLine();
        }
    }
}

7. //program to demonstrate a class boxone which has a method that returns a value

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

namespace ConsoleApplication1
{
    class boxone
    {
        private int width;
        private int depth;
        private int height;
        public void getdata()
        {
            width = 10;
            depth = 20;
            height = 30;
        }
        public int volume()
        {
            int vol;
            vol = width * depth * height;

            return vol;
        }
        public void showdata()
	{
		Console.WriteLine("width of box is "+ width);
		Console.WriteLine("depth of box is " + depth);
        Console.WriteLine("height of box is " + height);
	}
    };
    class Program
    {
        static void Main(string[] args)
        {
            int v;
            boxone ob=new boxone();
            ob.getdata();
            ob.showdata();
            v= ob.volume();
            Console.WriteLine("Volume of box is " + v);
            Console.ReadLine();
        }
    }
}

8. //program to demonstrate nested classes

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

namespace ConsoleApplication1
{
    class marks
    {
        private int physics;
        private int maths;
        private int chemistry;
        public void getmarks(int p, int m, int c)
        {
            physics = p;
            maths = m;
            chemistry = c;
        }
        public void showmarks()
	{
		Console.WriteLine("marks in physics are " + physics);
		Console.WriteLine("marks in maths are " + maths);
        Console.WriteLine("marks in chemistry are " + chemistry);

	}
    }
    class studentmarks
    {
        private int rollno;
        private String name;
        private int clas;
        private marks ma;
        public void getdata()
        {
            rollno = 1;
            name = "abcdef";
            clas = 11;
            ma = new marks();
            ma.getmarks(89, 90, 91);
        }
        public void showdata()
	{
		Console.WriteLine("rollno of student is " + rollno);
		Console.WriteLine("name of student is "+ name);
        Console.WriteLine("class of student is " + clas);
		ma.showmarks();
	}
    }
    class Program
    {
        static void Main(string[] args)
        {
            studentmarks ob = new studentmarks();
            ob.getdata();
            ob.showdata();
            Console.ReadLine();
        }
    }
}