santosh asp.net tutorial

using System;em;
using System.Collections.Generic;

class DictionayDemo
{
    public DictionayDemo()
    {
        Console.WriteLine("This is Dictionay Demo::\n");
    }

    public void Show()
    {
         // Create a Dictionary, CustomerID is the key. Type is int
        // Customer object is the value. Type is Customer
        Dictionary<int, Customer> dictionaryCustomers = new Dictionary<int, Customer>();

        // Create Customer Objects
        Customer customr1 = new Customer()
        {
            ID = 101,
            Name = "Santosh kumar singh",
            Salary = 5000
        };

        Customer customr2 = new Customer()
        {
            ID = 102,
            Name = "Reena kumari",
            Salary = 7000
        };

        Customer customr3 = new Customer()
        {
            ID = 104,
            Name = "Manorma arya",
            Salary = 5500
        };

        // Add customer objects to the dictionary
        dictionaryCustomers.Add(customr1.ID, customr1);
        dictionaryCustomers.Add(customr2.ID, customr2);
        dictionaryCustomers.Add(customr3.ID, customr3);

        // Retrieve the value (Customer object) from the dictionary, 
        // using key (customer ID). The fastest way to get a value 
        // from the dictionary is by using its key
        Console.WriteLine("Customer 101 in customer dictionary");
        Customer customer101 = dictionaryCustomers[101];
        Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", 
                            customer101.ID, customer101.Name, customer101.Salary);
        Console.WriteLine("--------------------------------------------------");

        // It is also possible to loop thru each key/value pair in a dictionary
        Console.WriteLine("All customer keys and values in customer dictionary");
        foreach (KeyValuePair<int, Customer> customerKeyValuePair in dictionaryCustomers)
        {
            Console.WriteLine("Key = " + customerKeyValuePair.Key);
            Customer cust = customerKeyValuePair.Value;
            Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", cust.ID, cust.Name, cust.Salary);
        }
        Console.WriteLine("--------------------------------------------------");

        // You can also use implicitly typed variable VAR to 
        // loop thru each key/value pair in a dictionary. But try
        // to avoid using var, as this makes your code less readable
        Console.WriteLine("All customer keys and values in customer dictionary");
        foreach (var customerKeyValuePair in dictionaryCustomers)
        {
            Console.WriteLine("Key = " + customerKeyValuePair.Key);
            Customer cust = customerKeyValuePair.Value;
            Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", cust.ID, cust.Name, cust.Salary);
        }
        Console.WriteLine("--------------------------------------------------");

        // To get all the keys in the dictionary
        Console.WriteLine("All Keys in Customer Dictionary");
        foreach (int key in dictionaryCustomers.Keys)
        {
            Console.WriteLine(key);
        }
        Console.WriteLine("--------------------------------------------------");

        // To get all the values in the dictionary
        Console.WriteLine("All Customer objects in Customer Dictionary");
        foreach (Customer customer in dictionaryCustomers.Values)
        {
            Console.WriteLine("ID = {0}, Name = {1}, Salary = {2}", customer.ID, customer.Name, customer.Salary);
        }

        // If you try to add a key that already exists in the dictionary you 
        // will get an exception - An item with same key has already been 
        // added. So, check if the key already exists
        if (!dictionaryCustomers.ContainsKey(101))
        {
            dictionaryCustomers.Add(101, customr1);
        }

        // When accessing a dictionary value by key, make sure the dictionary 
        // contains the key, otherwise you will get KeyNotFound exception.
        if (dictionaryCustomers.ContainsKey(110))
        {
            Customer cus = dictionaryCustomers[110];
        }
        else
        {
            Console.WriteLine("Key does not exist in the dictionary");
        }
    }
}


class Customer
{
    public int ID { get; set; }
    public string Name { get; set; }
    public int Salary { get; set; }
}


class TestDictionay
{
    static void Main(string[] args)
    {
       
        DictionayDemo objDist = new DictionayDemo();
        objDist.Show();
        Console.ReadLine();
    }
}

  

using System;
using System.Collections.Generic;
using System.Collections;

class DisctionayDemo2
{
    public DisctionayDemo2()
    {
        Console.WriteLine("When use dictionay demo::\n");
    }

    public void Show()
    {
        Country country1 = new Country()
        {
            Code = "AUS",
            Name = "AUSTRALIA",
            Capital = "Canberra"
        };

        Country country2 = new Country()
        {
            Code = "IND",
            Name = "INDIA ",
            Capital = "New Delhi"
        };

        Country country3 = new Country()
        {
            Code = "USA",
            Name = "UNITED STATES",
            Capital = "Washington D.C."
        };

        Country country4 = new Country()
        {
            Code = "GBR",
            Name = "UNITED KINGDOM",
            Capital = "London"
        };

        Country country5 = new Country()
        {
            Code = "CAN",
            Name = "CANADA",
            Capital = "Ottawa"
        };

        //List<Country> listCountries = new List<Country>();
        //listCountries.Add(country1);
        //listCountries.Add(country2);
        //listCountries.Add(country3);
        //listCountries.Add(country4);
        //listCountries.Add(country5);

        Dictionary<string, Country> dictionaryCountries = new Dictionary<string, Country>();
        dictionaryCountries.Add(country1.Code, country1);
        dictionaryCountries.Add(country2.Code, country2);
        dictionaryCountries.Add(country3.Code, country3);
        dictionaryCountries.Add(country4.Code, country4);
        dictionaryCountries.Add(country5.Code, country5);

        string strUserChoice = string.Empty;
        do
        {
            Console.WriteLine("Please enter country code");
            string strCountryCode = Console.ReadLine().ToUpper();

            // Find() method of the list class loops thru each object in the list until a match 
            // is found. So, if you want to lookup a value using a key dictionary is better 
            // for performance over list. 
            // Country resultCountry = listCountries.
            //                                    Find(country => country.Code == strCountryCode);

            Country resultCountry = dictionaryCountries.ContainsKey(strCountryCode) ? dictionaryCountries[strCountryCode] : null;

            if (resultCountry == null)
            {
                Console.WriteLine("The country code you enetered does not exist");
            }
            else
            {
                Console.WriteLine("Name = " + resultCountry.Name + " Captial =" + resultCountry.Capital);
            }

            do
            {
                Console.WriteLine("Do you want to continue - YES or NO?");
                strUserChoice = Console.ReadLine().ToUpper();
            }
            while (strUserChoice != "NO" && strUserChoice != "YES");
        }
        while (strUserChoice == "YES");
    }
}

public class Country
{
    public string Name { get; set; }
    public string Code { get; set; }
    public string Capital { get; set; }
} 

class TestDictionay
{
    static void Main(string[] args)
    {

        DisctionayDemo2 objDisct = new DisctionayDemo2();
        objDisct.Show();
        Console.ReadLine();
    }
}