Lambda Expressions

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 LambdaExpressions
{

    public partial class Form1 : Form
    {

        public delegate bool MyPredicate(int n);

        List<int> intList = new List<int>();
        Random rand = new Random();

        public Form1()
        {
            InitializeComponent();
        }
        private List<int> FindAll(MyPredicate predicate)
        {
            List<int> list = new List<int>();
            //write code to return all the odd values of the intList
            foreach (int n in intList)
            {
                if (predicate(n))
                {
                    list.Add(n);
                }
            }
            return list;
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //initialize intList with random values
            for (int i = 1; i <= 50; i++)
            {
                intList.Add(rand.Next(-99, 100));
            }
            Display(intList);
        }
        //display method to display any list
        private void Display(List<int> list)
        {
            listBox1.Items.Clear();
            foreach (int n in list)
                listBox1.Items.Add(n);
        }

        private void btnOddValues_Click(object sender, EventArgs e)
        {
            //MyPredicate predicate = delegate(int n)
            //{
            //    return n % 2 != 0;
            //};
            MyPredicate predicate = n => n % 2 != 0;
            List<int> oddList = FindAll(predicate);
            Display(oddList);
        }

        private void btnEvenPositives_Click(object sender, EventArgs e)
        {
            //define a predicate for the even positives
            //MyPredicate predicate = n => n > 0 && n % 2 == 0;
            List<int> evenPositives = FindAll(n => n > 0 && n % 2 == 0);
            Display(evenPositives);
        }

        private void btnOddNegatives_Click(object sender, EventArgs e)
        {
            List<int> oddNegatives = FindAll(n => n < 0 && n % 2 != 0);
            Display(oddNegatives);
        }
    }
}
//Lab
///Define a delegate type that takes an array of strings and 
///returns a boolean
///
///Create a List of strings (like names) and 
///initialize it in form1_load, with at least 20 names
///
///Write a FindAll method that return all the strings that 
///satisfy the predicate condition,passed to it
///
///use lambda expression 
///to get all the names whose length is greater than a certain
///value read from user
///
/// to get all the names that starts with a certain letter
/// read from user