How can I add the value of an item in a list box to a local variable in C#?

Question

So I'm doing a practical that involves asking the user to input a score between 0 and 100. The program will keep track of the number of scores that have been entered, the total score (sum of all scores) and the average score.

To calculate the total score, I've come up of the idea of using a for loop that will cycle through my listbox and add each score to a variable (below).

int sTotal = 0;
for(int i = 0; i < lstScores.Items.Count; i++)
{
    //Calculation occurs here
}
txtScoreTotal.Text = Convert.ToString(sTotal);

Thing is, I don't exactly know how to do it. I've tried searching to no avail. Any help would be greatly appreciated.

Answer 1

    int sTotal = 0;
    int Average = 0;
    for(int i = 0; i < lstScores.Items.Count; i++)
    {
         bool result = Int16.TryParse(lstScores.Items[i],out int res);
         if (result)
         {
            sTotale += res;        
         }
    }
    Average = sTotal / lstScores.Items.Count;
    txtScoreTotal.Text = Convert.ToString(sTotal);

Answer 2

Easiest is it to do with a foreach loop like this:

        int sTotal = 0;
        foreach (string item in lstScores.Items)
        {
            sTotal += Int32.Parse(item);
        }
        txtScoreTotal.Text = Convert.ToString(sTotal);

Answer 3

See this

int i = 0, result = 0;
while (i < lstScores.Items.Count)
{
   result += Convert.ToInt32(lstScores.Items[i++]);
}

txtScoreTotal.Text = Convert.ToString(result);

I havent tried following, but you can try 1 line solution too

var sum = lstScores.Items.OfType<object>().Sum(x => Convert.ToInt32(x));

You need to handle exception if sum exceedes int.Max