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;

using System.Threading.Tasks;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

int Fx(int a, int b, int c=4)

{

return 100 * a + 10 * b + c;

}

private void button1_Click(object sender, EventArgs e)

{

button1.Text = Fx(1, c: 3, b: 2).ToString();

//default and named parameters

}

String s = "";

int Display(int x)

{

int d = x;

for (int i = 0; i < 100000000; i++)

{

if (d > 1234)

d += i;

else

d = -i;

}

return d;

}

private void button4_Click(object sender, EventArgs e)

{

int[] z = { 0, 0, 0, 0 };

for (int i = 0; i < 4; i++)

z[i] += Display(i);

button4.Text = (z[0]+z[1]+z[2]+z[3]).ToString();

}

private void button2_Click(object sender, EventArgs e)

{

int[] z = { 0, 0, 0, 0 };

// ParallelOptions options = new ParallelOptions { MaxDegreeOfParallelism = 4 };

Parallel.For(0, 4, i =>

{

z[i] = Display(i);

});

button2.Text = (z[0] + z[1] + z[2] + z[3]).ToString();

/*

Parallel.ForEach(Stocks, stock =>

{

StockService.CallService(stock);

});

*/

}

private void button3_Click(object sender, EventArgs e)

{

int[] z = { 0, 0, 0, 0 };

Parallel.Invoke

(

() => z[0] = Display(1),

() => z[1] = Display(2),

() => z[2] = Display(3),

() => z[3] = Display(4)

);

button3.Text = (z[0] + z[1] + z[2] + z[3]).ToString();

}

string ShowMsgBox()

{

int[] z = { 0, 0, 0, 0 };

for (int i = 0; i < 4; i++)

z[i] += Display(i);

return (z[0] + z[1] + z[2] + z[3]).ToString();

// MessageBox.Show("hello task 1", "sdf");

}

private void button5_Click(object sender, EventArgs e)

{

string st = "";

Task task1 = Task.Factory.StartNew

(() => st=ShowMsgBox());

Task.WaitAll(task1);

button4.Text = st;

button5.Text = "Done";

}

private void button6_Click(object sender, EventArgs e)

{

//Project Properties -> Add Reference

System.Numerics.BigInteger X = new System.Numerics.BigInteger();

X = 1;

int I = Convert.ToInt32(textBox2.Text);

for (int i = 2; i <= I; i++)

{

X *= i;

}

textBox1.Text = X.ToString();

}

}

}