C# Find Prime Numbers from Array (Console Application)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace prime_number

{

    class findPrime

    {

        int[] num = new int[5]; /*Creating array for numbers*/

        int i, j;

        bool isprime,noprime = true;

        public findPrime()

        {

            Console.WriteLine("Please enter 5 numbers: ");

            for(i = 0; i < 5; i++)

                num[i] = Int16.Parse(Console.ReadLine());  /* add Numbers to the Array*/

          

            for(i = 0; i < 5; i++)

            {

                isprime = true; /* initialize Current number as prime Number is "true"*/

                for (j = 2; j <= (num[i] / 2); j++) 

                     /* for Diving numbers for Remainder "0" from 2 to the half of the Number*/

                {

                    if (num[i] % j == 0)

                    {

                        isprime = false; 

                        /*if  Remainder "0" Found set Current Number as prime is "false" and break the loop */

                        break;

                    }

                }

                if (isprime) /*if  no Remainder "0"  Display current Number as Prime Number*/

                {

                    noprime = false;

                    Console.WriteLine(num[i] + " is a Prime Number");

                }

            }

            if (noprime)

                Console.WriteLine("There is no a Prime number in  the list");

        }

    }

   

    class Program

    {

        static void Main(string[] args)

        {

            findPrime pn = new findPrime(); /* Create object of the class */

            Console.ReadLine();

        }

    }

}

C# (H.A.)Find Biggest number from 2d array

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

namespace ConsoleApplication1

{

    class Program

    {

       

        static void Main(string[] args)

        {

            int[,] a = new int[3,3];

            int i, j,result = 0;

            Console.WriteLine("Please enter 9 numbers ");

            for (i=0; i < 3; i++)

            {

                for (j = 0; j < 3; j++)

                {

                    a[i,j] = Int16.Parse(Console.ReadLine());

                }

            }

            Console.WriteLine("Entered numbers");

            result = a[0, 0];

            for (i = 0; i < 3; i++)

            {

                for (j = 0; j < 3; j++)

                {

                    Console.Write(a[i, j] + " ");

                    if (a[i, j] >= result)

                    {

                        result = a[i, j];

                    }

                }

                Console.WriteLine();

            }

           Console.WriteLine(result + " is a biggest number");

           Console.ReadLine();

        }

      

    }

}