Question

I am trying to add a code behind the add button my code is this:

class CalculateValues
    {
        private int _num1;
        private int _num2;


        public int Num1
        {
            get
            {
                return _num1;
            }
            set
            {
                _num1 = value;
            }
        }
        public int Num2
        {
            get
            {
                return _num2;
            }
            set
            {
                _num2 = value;
            }
        }
        public virtual int calculate()
        {
            return _num1 + _num2;

        }
    }

Here is the other code that has the button on it:

public partial class Form2 : Form
    {
        public Form2()
        {
            CalculateValues myAdd = new CalculateValues();
            MulitplyValues Add = new MulitplyValues();
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            int total = myadd.Add(int.Parse(textBox1.Text), int.Parse(textBox2.Text));    
            MessageBox.Show(total.ToString());

        }

But everytime it tell me 'myAdd' does not exist in the current context
I am not understanding why it is not working. I have even tried a few different ways.

Answer 1

This is a scope issue. You define myAdd inside the constructor Form2(), which means it’ll only be available in that scope: only the constructor can use it, after that it’s gone.

If you want a variable to persist, move it to the class scope.

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