whats wrong with this?

[Psycho_Coder]

it wont let me run the program, I can not find any errors in my code.....

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

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

        private void Form1_Load(object sender, EventArgs e)
        {
            Double vall, val2; //We are declaring two double variables

            //we assign to the first variable of the text box
            //to a double to assign it to "vall"

            //note that we assign using "=" as an operation

            vall = Double.Parse(textBox1.Text);
            //double.parse("string") converts the strings into brackets

            //same thing that happens for the second variable

            val2 = Double.Parse(textBox2.Text);

            //now we are doing the exact opposite
            //we double the values and convert the sum to a string
            //using the .tostring() command

            textBox3.Text = (vall + val2).ToString();
        }
    }
}