[SEM04][labPT][C#]Laborki 5 pkt 1 oraz prawie 4

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;
using System.Net;

namespace Lab5PT
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private double getNominator(int k, int n){
            double result = 1;
            for(int i = 0; i < k; i++){
                result *= n - i;
            }
            return result;
        }
        private double getDenominator(int k){
            double result = 1;
            for(int i = 1; i <= k; i++){
                result *= i;
            }
            return result;
        }
        public delegate double AsyncNominatorCaller(int k, int n);
        public delegate double AsyncDenominatorCaller(int k);
        private void button1_Click(object sender, EventArgs e)
        {
            //Group I - Compute(Task)
            if(textBox1.Text.Equals("") || textBox2.Equals("")){
                MessageBox.Show("You have to define N and K!");
                return;
            }
            double nominator, denominator;
            double result = -1;
            int n, k;
            n = Convert.ToInt32(textBox1.Text);
            k = Convert.ToInt32(textBox2.Text);
            Task<double> task1 = new Task<double>(() => getNominator(k, n));
            Task<double> task2 = new Task<double>(() => getDenominator(k));
            task1.Start();
            task2.Start();
            task1.Wait();
            task2.Wait();
            nominator = task1.Result;
            denominator = task2.Result;
            result = nominator / denominator;
            textBox3.Text = result.ToString();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            //Async
            double denominator, nominator, result;
            int n, k;
            n = Convert.ToInt32(textBox1.Text);
            k = Convert.ToInt32(textBox2.Text);
            AsyncDenominatorCaller dCaller = new AsyncDenominatorCaller(getDenominator);
            AsyncNominatorCaller nCaller = new AsyncNominatorCaller(getNominator);
            IAsyncResult deRes = dCaller.BeginInvoke(k, null, null);
            IAsyncResult nRes = nCaller.BeginInvoke(k, n, null, null);
            denominator = dCaller.EndInvoke(deRes);
            nominator = nCaller.EndInvoke(nRes);
            result = nominator / denominator;
            textBox4.Text = result.ToString();

        }

        private void button3_Click(object sender, EventArgs e)
        {
            string file = System.IO.File.ReadAllText(@"C:\Users\Kamilos\Documents\visual studio 2012\Projects\Lab5PT\Lab5PT\adresy.txt");
            file = file.Replace(",","");
            string[] adresses = file.Split(' ');
            /*string[] results = new string[adresses.Length];
            for(int i = 0; i < adresses.Length; i++){
                results[i] = Dns.GetHostEntry(adresses[i]).AddressList[0].ToString();
            } */
            string
            var result = from x in adresses.AsParallel()
                            select new {
                                domain = x,
                                ip = Dns.GetHostEntry(x).AddressList[0].ToString()
                            };
            foreach(var x in result){
                textBox5.AppendText(
            }

        }

    }
}