I&#39;m new with C#, I have some basic knowledge in Java but I can&#39;t get this code to run properly.

It&#39;s just a basic calculator, but when I run the program VS2008 gives me this error:

![Calculator][1]

I did almost the same program but in java using JSwing and it worked perfectly.


Here&#39;s the form of c#:

![Form][2]

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;

    namespace calculadorac
    {
        public partial class Form1 : Form
        {

        int a, b, c;
        String resultado;

        public Form1()
        {
            InitializeComponent();
            a = Int32.Parse(textBox1.Text);
            b = Int32.Parse(textBox2.Text);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            add();
            result();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            substract();
            result();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            clear();
        }

        private void add()
        {
            c = a + b;
            resultado = Convert.ToString(c);
        }

        private void substract()
        {
            c = a - b;
            resultado = Convert.ToString(c);
        }

        private void result()
        {
            label1.Text = resultado;
        }

        private void clear()
        {
            label1.Text = &quot;&quot;;
            textBox1.Text = &quot;&quot;;
            textBox2.Text = &quot;&quot;;
        }
    }

What can be the problem? Is there a way to solve it?

PS: I also tried

    a = Convert.ToInt32(textBox1.text);
    b = Convert.ToInt32(textBox2.text);

and it didn&#39;t work.


  [1]: http://i.stack.imgur.com/yWpBd.png
  [2]: http://i.stack.imgur.com/u26pk.png

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Input string was not in a correct format