Question

Hello everyone I am trying to make since of what I am doing wrong or maybe I am over thinking it again. I am trying to create a class and in the class I am calling 2 private variables such as num1 and num2. Then i create a public property that corresponds to num 1 and num2. Then after I create that I need to create a public overriable method called calculate and this will add the two variables together and returns the results. Then I have a add button that I have to add the code to the button that adds the two numbers and output the result to a messagebox.I have tried a couple different ways and I still am not getting it.
Here is code 1:

 public abstract class CalulateValues
{
    protected List<int> values = new List<int>();
    public void AddValue(int value) { values.Add(value); }
    public abstract int Calculate();

}

public class Add : CalulateValues
{
    public override int Calculate()
    {
        return values.Sum(x => x);
    }
}

and here is code 2 I tried:

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;

    }
}

Now when it comes with the button I have tried this code:

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());

    }

I am not too sure what I am doing wrong maybe I am not laying out the code the right way.

Answer 1

You have declared myAdd as a local variable in the Form2 constructor. Declare it as a global variable in order to be able to call it from button1_Click()

In addition to this, are you getting any error or exception? Second, where did you declare Add method that accepts two parameters?