Dictionary/Tutorial

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            // this is how to add information to dictionary
            Customer customer1 = new Customer()

            {
                ID = 101,
                name = "Stefan",
                salary = 10000


            };
            Customer customer2 = new Customer()
            {
                ID = 102,
                name = "Harvey",
                salary = 9000
            };


            // this is how to put the information in the dictionary
            // pay attention we cannot add a value more than once
            Dictionary<int, Customer> dictionaryCustomers = new Dictionary<int, Customer>();
            dictionaryCustomers.Add(customer1.ID, customer1);
            dictionaryCustomers.Add(customer2.ID, customer2);
            //Customer customer119 = dictionaryCustomers[101];
            // check for key containing


            //if (!dictionaryCustomers.ContainsKey(customer1.ID))
            //{
            //    dictionaryCustomers.Add(customer1.ID, customer1);
            //}


            // this is how we could use the information
            Console.WriteLine("ID-{0} name-{1} salary-{2}", customer1.ID, customer1.name, customer1.salary);



            // this is how to print a dictionary in a list
            foreach (KeyValuePair<int, Customer> someValue in dictionaryCustomers)
            {
                Console.WriteLine("Key: {0}", someValue.Key);
                Customer cust = someValue.Value;
                Console.WriteLine("ID: {0} Name: {1} Salary:{2}", cust.ID, cust.name, cust.salary);
                Console.WriteLine("--------------------------------------------------------------");
            }


            // print only the value which we need
            foreach (Customer cust in dictionaryCustomers.Values)
            {
                Console.WriteLine("ID: {0} Name: {1} Salary:{2}", cust.ID, cust.name, cust.salary);
                Console.WriteLine("--------------------------------------------------------------");
            }

            //how to get value
            Customer cast;
            dictionaryCustomers.TryGetValue(101, out cast);
            for (int i = 101; i < 103; i++)
            {
                if (dictionaryCustomers.TryGetValue(i, out cast))
                {
                    cast.salary += 100;
                }
            }
            foreach (KeyValuePair<int, Customer> item in dictionaryCustomers)
            {
                Customer customerTest = item.Value;
                Console.WriteLine("ID: {0} Name: {1} Salary:{2}", customerTest.ID, customerTest.name, customerTest.salary);
                Console.WriteLine("###################################################################");
            }



        }
        // this is how to create a new dictionary
        public class Customer
        {
            public int ID { get; set; }
            public string name { get; set; }
            public int salary { get; set; }
        }
    }
}