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Visual Studio Code – Sum multiple numbers in C# Form Application

The function of the form is that if I put a number in the text box and click the add button, the label shows the number. Then, if I put another number in the text box and click the add button, the label shows the sum of those two numbers.

Example:
If I put 10 in the text box and click the add button, the label shows 10.
Then I put 8 in the text box and click the add button; the label shows 10 + 8 = 18.
Then I put 2 in the text box and click the add button; the label shows 18 + 2 = 20.

I created the form application, but it is not working correctly.
Can anyone please give me a solution to this problem?

namespace ICT_Project_Prac
{
    public partial class Form1 : Form
    {
        private int sum;
        public Form1()
        {
            InitializeComponent();
            sum = 0;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                sum = int.Parse(textBox1.Text);
                sum = +sum;
                label1.Text = sum.ToString();
            }
            catch
            {
                MessageBox.Show("Please Ender The Valid Number");
            }
        }
    }
}
Tags:

2

Answers


  1. 0

    Your problem is that you allways put "sum = int.Parse(textBox1.Text);" so you loose your "sum" value before you sum with the new value.

    You should do this.

    namespace ICT_Project_Prac
{
    public partial class Form1 : Form
    {
        private int sum;
        public Form1()
        {
            InitializeComponent();

            sum = 0;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int textBoxValue = int.Parse(textBox1.Text);
                sum += textBoxValue;
                label1.Text = sum.ToString();
            }
            catch
            {
                MessageBox.Show("Please Ender The Valid Number");
            }
        }
    }
}
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  2. 0

    first thing you are adding new value to the sum wrong if you want to add a value to the current value of a variable you can use on of these methods
    lets say you want to add 2 to sum:

    sum = sum + 2;// method 1
sum += 2;     // method 2

    as for the way you should read the value inside of the text box and add it to the sum:

        private int sum = 0;
    public Form1()
    {
        InitializeComponent();            
    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            int currentValue = int.Parse(textBox1.Text);
            label1.Text = $"{sum} + {currentValue} = {sum + currentValue}";
            sum += currentValue;

        }
        catch (Exception)
        {
            MessageBox.Show("Please Ender The Valid Number");
        }

    }

    here is what’s wrong with your code:

                sum = int.Parse(textBox1.Text); // here you are changing the value of sum to the value in the text box.

            sum = +sum; // here you are changing the value of sum to be positive sum (+sum).

            label1.Text = sum.ToString(); // this way will change the text of the label to be the sum value only which is not the way you want it like 5 + 3 = 8.
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