C#

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

namespace sudoku
{
    class sudoku
    {
        private int[] values_right = new int[81];

        private int[] squareindex = new int[81] {0, 0, 0, 1, 1, 1, 2, 2, 2,
                                                 0, 0, 0, 1, 1, 1, 2, 2, 2,
                                                 0, 0, 0, 1, 1, 1, 2, 2, 2,
                                                 3, 3, 3, 4, 4, 4, 5, 5, 5,
                                                 3, 3, 3, 4, 4, 4, 5, 5, 5, 
                                                 3, 3, 3, 4, 4, 4, 5, 5, 5, 
                                                 6, 6, 6, 7, 7, 7, 8, 8, 8, 
                                                 6, 6, 6, 7, 7, 7, 8, 8, 8, 
                                                 6, 6, 6, 7, 7, 7, 8, 8, 8};

        private int[] posible_values = new int[9] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

        public sudoku()
        {
            this.generate();
        }

        public void generate()
        {
            /*
            int[] values = {8, 4, 6, 3, 5, 1, 7, 9, 2, 
                            5, 1, 3, 9, 2, 7, 4, 6, 8, 
                            7, 9, 2, 6, 8, 4, 1, 3, 5,
                            4, 3, 8, 5, 7, 9, 6, 2, 1, 
                            1, 7, 9, 2, 4, 6, 5, 8, 3, 
                            2, 6, 5, 8, 1, 3, 9, 7, 4, 
                            6, 8, 1, 7, 3, 5, 2, 4, 9, 
                            9, 2, 4, 1, 6, 8, 3, 5, 7, 
                            3, 5, 7, 4, 9, 2, 8, 1, 6};
            */


            Random rnd = new Random();
            int i;
           


            for (i = 0; i < 81; i++)
            {
                while (this.values_right[i] == 0)
                    this.values_right[i] = rnd.Next(1, 90) % 10;


                while (check_position(i) == 0)
                {
                    this.values_right[i] = (this.values_right[i] + 1) % 10;

                }
            }

        }

        public int[] get_values_right()
        {
            return values_right;
        }

        int check_position(int i)
        {
            if (this.values_right[i] == 0)
                return 0;

            Random rnd = new Random();
            int row = i - (i % 9);
            int col = i % 9;
            int position;

             for (position = row; position < row + 9; position++)
            {
                if (position == i)
                    continue;

                if (this.values_right[position] == this.values_right[i])
                    return 0;
            }

           /*for (position = col; position < 80; position += 9)
            {
                if (position == i)
                    continue;

                if (this.values_right[position] == this.values_right[i])
                    return 0;
            }*/


            return 1;
        }
    }
}

using System;<br />
using System.IO;<br />
using System.Runtime.Serialization;<br />
using System.Runtime.Serialization.Formatters.Binary;<br />
using System.Collections.Generic;<br />
<br />
namespace MyObjSerial<br />
{<br />
    [Serializable()]	//Set this attribute to all the classes that you define to be serialized<br />
    public class Employee : ISerializable<br />
    {<br />
        public int EmpId;<br />
        public string EmpName;<br />
<br />
        //Default constructor<br />
        public Employee()<br />
        {<br />
            EmpId = 0;<br />
            EmpName = null;<br />
        }<br />
<br />
        //Deserialization constructor.<br />
        public Employee(SerializationInfo info, StreamingContext ctxt)<br />
        {<br />
            //Get the values from info and assign them to the appropriate properties<br />
            EmpId = (int)info.GetValue("EmployeeId", typeof(int));<br />
            EmpName = (String)info.GetValue("EmployeeName", typeof(string));<br />
        }<br />
<br />
        //Serialization function.<br />
        public void GetObjectData(SerializationInfo info, StreamingContext ctxt)<br />
        {<br />
            //You can use any custom name for your name-value pair. But make sure you<br />
            // read the values with the same name. For ex:- If you write EmpId as "EmployeeId"<br />
            // then you should read the same with "EmployeeId"<br />
            info.AddValue("EmployeeId", EmpId);<br />
            info.AddValue("EmployeeName", EmpName);<br />
        }<br />
    }<br />
<br />
    //Main class<br />
    public class ObjSerial<br />
    {<br />
        public static void Main(String[] args)<br />
        {<br />
            //Create a new Employee object<br />
            List<Employee> mp = new List<Employee>();<br />
            Employee e = new Employee();<br />
            e.EmpId = 10;<br />
            e.EmpName = "Omkumar";<br />
            mp.Add(e);<br />
            e.EmpId = 11;<br />
            e.EmpName = "this";<br />
            mp.Add(e);<br />
            e.EmpId = 12;<br />
            e.EmpName = "is a";<br />
            mp.Add(e);<br />
            e.EmpId = 13;<br />
            e.EmpName = "test";<br />
            mp.Add(e);<br />
<br />
            mp.Add(e);<br />
<br />
            // Open a file and serialize the object into it in binary format.<br />
            // EmployeeInfo.osl is the file that we are creating. <br />
            // Note:- you can give any extension you want for your file<br />
            // If you use custom extensions, then the user will now <br />
            //   that the file is associated with your program.<br />
            Stream ostream = File.Open("EmployeeInfo.osl", FileMode.Create);<br />
            BinaryFormatter bformatter = new BinaryFormatter();<br />
<br />
            Console.WriteLine("Writing Employee Information");<br />
            bformatter.Serialize(ostream, mp);<br />
            ostream.Close();<br />
<br />
            //Clear mp and bf for further usage.<br />
            mp = null;<br />
            bformatter = null;<br />
<br />
            //Open the file written above and read values from it.<br />
            Stream istream = File.Open("EmployeeInfo.osl", FileMode.Open);<br />
            bformatter = new BinaryFormatter();<br />
<br />
            Console.WriteLine("Reading Employee Information");<br />
            mp = (List<Employee>)bformatter.Deserialize(istream);<br />
            istream.Close();<br />
            foreach (Employee f in mp)<br />
            {<br />
                Console.WriteLine("Employee Id: {0}", f.EmpId.ToString());<br />
                Console.WriteLine("Employee Name: {0}", f.EmpName);<br />
            }<br />
<br />
        }<br />
    }<br />
}<br />