Listbox Items not displaying

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My Dice Rolling program is not displaying results in the listbox, any suggestions to remedy this issue much appreciated, here is the code:

C#

{
    public partial class FormDice : Form
    {
        int sides;
        int answer;

        public FormDice()
        {
            InitializeComponent();
        }

        private void exitButton_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void clearButton_Click(object sender, EventArgs e)
        {
            twoRadioButton.Checked = false;
            tenRadioButton.Checked = false;
            fiftyRadioButton.Checked = false;
            resultsListBox.Items.Clear();
        }

        private void rollButton_Click(object sender, EventArgs e)
        {
           

            if(twoRadioButton.Checked == true)
            {
                sides = 2;
                RollDice roll = new RollDice(sides);
                answer = roll.Roll();
            }

            else if(tenRadioButton.Checked == true)
            {
                sides = 10;
                RollDice roll = new RollDice(sides);
                answer = roll.Roll();
            }

            else if(fiftyRadioButton.Checked == true)
            {
                sides = 50;
                RollDice roll = new RollDice(sides);
                answer = roll.Roll();
            }

            else
            {
                RollDice roll = new RollDice(sides);
                answer = roll.Roll();
            } 
        }

        private void resultsListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            resultsListBox.Items.Add(answer.ToString());
        }

       
    }
}

C#

{
    class RollDice
    {
        //variables
        private int numberOfSides;
        private Random randomNumberGenerator = new Random();

        //constructor with no parameters
        public RollDice()
        {
            numberOfSides = 6;
        }

        //constructor with parameter
        public RollDice(int sides)
        {
            numberOfSides = sides;
        }


        //method to roll the dice by returning an integer value
        public int Roll()
        {
            int randomNumber = randomNumberGenerator.Next(1, numberOfSides + 1);
            return randomNumber;
        }


    }


}

Posted 17-Apr-12 18:04pm

Nancylh23

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VJ Reddy · Accepted Answer · 2012-04-17T18:14:00

The reason is that the item is being added in SelectedIndexChanged event of resultsListBox as given in the question

C#

private void resultsListBox_SelectedIndexChanged(object sender, EventArgs e)
{
   resultsListBox.Items.Add(answer.ToString());
}

If the result is required to be added when the rollButton is clicked, then add the item

C#

resultsListBox.Items.Add(answer.ToString());

in the Click event of rollButton, rollButton_Click event.