using System;

​

public class PrimeNumbers

{

    public static void Main(string[] args)

    {

        string firstInput;

        string secondInput = "";

        int firstNumber;

        int secondNumber;

        int number;

        int i;

        int counter;

        Console.WriteLine("Prime Numbers");

        Console.Write("Enter first number: ");

        firstInput = Console.ReadLine();

        if(Int32.TryParse(firstInput, out firstNumber) == true)

        {

            if(firstNumber < 0 || firstNumber > 5000)

            {

                Console.Write("Input error, please input a correct first number value. \nInput number must be from 1 to 5,000 only.");

            }

            else

            {

                Console.Write("Enter second number: ");

                secondInput = Console.ReadLine();

            }

            if(Int32.TryParse(secondInput, out secondNumber) == true)

            {

                if(secondNumber < firstNumber)

                {

                    Console.WriteLine("No output, second number input must be greater than the first input.");

                }

                else if (secondNumber < 0 || secondNumber > 5000)

                {

                    Console.Write("Input error, please input a correct first number value. \nInput number must be from 1 to 5,000 only.");

                }

                else 

                {

                }

            }

            else

            {

                Console.WriteLine("Invalid input, letters or special characters for first number are not allowed. \nInput number must be from 1 to 5,000 only.");

            }

        }

        else

        {

            Console.WriteLine("Invalid input, letters or special characters for first number are not allowed. \nInput number must be from 1 to 5,000 only.");

        }

    }

}

​

​

​