Question

How can I check to see if the textbox is empty and then only divide by that number of int. As you can see now I will divide by 10 everytime so now I need help with error checking.

namespace Assignment1_White
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int num1;
            int num2;
            int num3;
            int num4;
            int num5;
            int num6;
            int num7;
            int num8;
            int num9;
            int num10;
            int answer;

            num1 = int.Parse(num100.Text);
            num2 = int.Parse(num200.Text);
            num3 = int.Parse(num300.Text);
            num4 = int.Parse(num400.Text);
            num5 = int.Parse(num500.Text);
            num6 = int.Parse(num600.Text);
            num7 = int.Parse(num700.Text);
            num8 = int.Parse(num800.Text);
            num9 = int.Parse(num900.Text);
            num10 = int.Parse(num1000.Text);



            answer = (num1 + num2 + num3 + num4 + num5 + num6 + num7 + num8 + num9 +num10)/10;
            MessageBox.Show(answer.ToString());

Answer 1

You could do something like:

int count = 0;

//For each textbox
if(num100.Text != "")
{
     num1 = int.Parse(num100.Text);
     count++;
}

Then divide by count