Question

I am having problem with random number generation in c#. If I RUN this form application directly, the random number generation is same for all.

If i DEBUG this line by line by pressing F10, then it will generate different random numbers. Why this is happening? What should I do to generate different random numbers?

Greyhound.cs

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

namespace ADayAtTheRaces
{
    class Greyhound
    {
        int location=0;
        Random randomize = new Random();

        public int run()
        {
            location = randomize.Next(0, 100);
            return location;
        }
    }
}

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ADayAtTheRaces
{
    public partial class Form1 : Form
    {
        Greyhound[] greyHound = new Greyhound[4];
        ProgressBar[] progressBar = new ProgressBar[4];
        public Form1()
        {
            InitializeComponent();
            for (int i = 0; i < 4; i++)
            {
                greyHound[i] = new Greyhound();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i <= 3; i++)
            {
                progressBar[i].Value = greyHound[i].run();
            }
        }
    }
}

Answer 1

Don’t instantiate a new Random object each time, instead use it as a static member:

class Greyhound
{
    static Random randomize = new Random();
    int location=0;

    public int run()
    {
        location = randomize.Next(0, 100);
        return location;
    }
}

See Random.Next returns always the same values