Contact Book | C# Online Compiler

Contact Book by Varun Nasit

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;

namespace Contact_Management
{
    public class Program
    {
        public static void Main(string[] args)
        {
            bool validInput = true;
            ContactBook cb = new ContactBook();
			
            Console.WriteLine("--------Contact Management--------");
			
            while (validInput)
            {
                ContactBook.PrintOptions();
                var input = Console.ReadLine();

                switch (input)
                {
                    case "1":
                        cb.CreateContact();
                        break;
                    case "2":
                        cb.UpdateContact();
                        break;
                    case "3":
                        cb.DeleteContact();
                        break;
                    case "4":
                        cb.ShowAllContacts();
                        break;
					case "5":
                        cb.SearchRecord();
                        break;
					case "6":
                        cb.WriteToFile();
                        break;
					case "7":
                        cb.ReadFromFile();
                        break;
					case "8":
                        validInput = false;
						break;
                    default:
                        validInput = false;
                        break;
                }
            }
        }
    }

    class Person
    {
        public string Name { get; set; }
        public int Id;
        public string MobileNo { get; set; }
        public string City { get; set; }
		
        public Person(string name, string mobileNo, string city)
        {
            // this.Id = AutoIncrementId();
            this.Name = name;
            this.MobileNo = mobileNo;
            this.City = city;
        }
    }

    class ContactBook
    {
        public int id = 1;
        private List<Person> contactBookList = new List<Person>();
        public List<Person> ContactBookList
        {
            get { return contactBookList; }
            set { this.contactBookList = value; }
        }

        public ContactBook()
        {
            ContactBookList = new List<Person>();
        }

		public static void PrintOptions()
        {
            Console.WriteLine("\n Choose One from following Options: \n");
            Console.WriteLine(" #1 Add Contact");
            Console.WriteLine(" #2 Update Contact ");
            Console.WriteLine(" #3 Delete Contact");
            Console.WriteLine(" #4 Show All Contacts");
			Console.WriteLine(" #5 Search Records");			
			Console.WriteLine(" #6 Save");
            Console.WriteLine(" #7 Get All Records From File");		
			Console.WriteLine(" #8 Exit \n");
        }
		
        public void CreateContact()
        {
        startInsert: Console.WriteLine("\n Enter Name :");
            var name = Console.ReadLine();
            Console.WriteLine("Enter Mobile Number :");
            var moNo = Console.ReadLine();
            Console.WriteLine("Enter City Name :");
            var city = Console.ReadLine();

            var contactWithSameName = ContactBookList.Where(p => p.Name == name && p.MobileNo == moNo).SingleOrDefault();
			
            if (contactWithSameName == null)
            {
                Person person = new Person(name, moNo, city);
                person.Id = AutoIncrementId();
                AddContactToList(person);
            }
            else
            {
                Console.WriteLine("\n !!!!!! Contact is already available with this Name, Please Enter Different Name Or Mobile Number :");
                goto startInsert;
            }
        }

        private int AutoIncrementId()
        {
            return this.id++;
        }

        private void AddContactToList(Person person)
        {
            ContactBookList.Add(person);
        }

        public void ShowAllContacts()
        {
            Console.WriteLine("\n----------------------------CONTACT-LIST----------------------------");
            Console.WriteLine("\n\nId \t\t    Name \t\t\t   Mobile No \t\t   City");
            Console.WriteLine("------------------------------------------------------------------------");

            if (ContactBookList.Count == 0)
            {
                Console.WriteLine("\t\t\t       No Data Found           ");
            }
			else
			{
            	foreach (var person in ContactBookList)
            	{
                	Console.Write(" {0,-10}", person.Id);
                	Console.Write("\t {0,-20}", person.Name);
                	Console.Write("{0,-20}", person.MobileNo);
                	Console.Write("{0,-20} \n", person.City);
            	}
            	Console.WriteLine();
			}
        }

        public void DeleteContact()
        {
            if (ContactBookList.Count != 0)
            {
            startDelete: Console.WriteLine("\n Enter name you want to delete :");
                var name = Console.ReadLine();
                var contactWithSameName = ContactBookList.Where(person => person.Name == name);

                if (contactWithSameName.Any())
                {

                    ContactBookList.RemoveAll(x => x.Name == name);
                }
                else
                {
                    Console.WriteLine("\n !!!!!! WRONG CHOICE.... Contact is not available with this Name \n");
                    Console.WriteLine("1. Please Enter Correct Name :");
                    Console.WriteLine("2. See Contact List :");
                    Console.WriteLine("3. Go Back to Main Menu : \n");

                    var ch = Console.ReadLine();

                    switch (ch)
                    {
                        case "1":
                            goto startDelete;
                        case "2":
                            ShowAllContacts();
                            goto startDelete;
                        case "3":
                            break;
                        default:
                            break;
                    }
                }
            }
            else
            {
                Console.WriteLine("\n!!!!! There is no data available to delete \n ");
            }
        }
		
		public void WriteToFile()
        {
            string json = JsonConvert.SerializeObject(ContactBookList.ToArray());
            
			
			//Method 1#
            // File.WriteAllText(@"F:\Prompt Softech\Documents\Contacts.txt",json);
			
			Console.WriteLine(json);

			// Method 2#
            /* using (StreamWriter file = File.CreateText(@"F:\Prompt Softech\Documents\Contacts.txt"))
            {
                JsonSerializer serializer = new JsonSerializer();
                serializer.Serialize(file, ContactBookList);
            } */
        }

		public void ReadFromFile()
        {
            /* 
			var json = File.ReadAllText(@"F:\Prompt Softech\Documents\Contacts.txt");
            List<Person> ContactBookList = JsonConvert.DeserializeObject<List<Person>>(json);

            Console.WriteLine("\n ----------------------------CONTACT-LIST----------------------------");
            Console.WriteLine("\n\nId \t\t Name \t\t   Mobile No \t\t City");
            Console.WriteLine("------------------------------------------------------------------------");

            if(ContactBookList.Count != 0)
			{
            	foreach (var person in ContactBookList)
            	{
                	Console.Write(" {0,-10}", person.Id);
                	Console.Write("\t {0,-20}", person.Name);
                	Console.Write("{0,-20}", person.MobileNo);
                	Console.Write("{0,-20} \n", person.City);
            	}
            	Console.WriteLine();
			}
			else
			{
				Console.WriteLine("\t\t\t No data found");
			}
		    */
        }
		
        public void UpdateContact()
        {
            if (ContactBookList.Count != 0)
            {
            startUpdate: Console.WriteLine("\n Enter existing name you want to update");
                var oldName = Console.ReadLine();
				
                var contactWithSameName = ContactBookList.Where(person => person.Name == oldName);

                if (contactWithSameName.Any())
                {

                updateOptions: Console.WriteLine("\n What you want to update, Choose from following :");
                    Console.WriteLine(" 1. Name");
                    Console.WriteLine(" 2. Mobile No.");
                    Console.WriteLine(" 3. City \n");
                    var updateInput = Console.ReadLine();
					
                    /* local functionn supported in c# 7.0,but i have c# 6.0,so its not supported..

                        void updateFunction(string s)
                        {
                            foreach (var person in contactWithSameName)
                            {
                                s == 1 ? person.Name = newName : 
                                s == 2 ? person.MobileNo = newMobileNo :
                                s == 3 ? person.City = newCity;
                            }
                        } 
                     */

                    switch (updateInput)
                    {
                        case "1":
                            Console.WriteLine("\n Enter new Name :");
                            var newName = Console.ReadLine();
                            //updateFunction("1");
                            foreach (var person in contactWithSameName)
                            {
                                person.Name = newName;
                            }
                            break;
							
                        case "2":
                            Console.WriteLine("\n Enter new Mobile No :");
                            var newMobileNo = Console.ReadLine();
                            foreach (var person in contactWithSameName)
                            {
                                person.MobileNo = newMobileNo;
                            }
                            break;
							
                        case "3":
                            Console.WriteLine("\n Enter new City :");
                            var newCity = Console.ReadLine();
                            foreach (var person in contactWithSameName)
                            {
                                person.City = newCity;
                            }
                            break;
                        
						default:
                            Console.WriteLine("\n\t !!!!! WRONG CHOICE : ");
                            Console.WriteLine("\t  1. Do you want to Continue? ");
                            Console.WriteLine("\t  2. Go Back to Main Menu : \n");
                            var ch = Console.ReadLine();

                            switch (ch)
                            {
                                case "1":
                                    Console.WriteLine("\n >>>>> Please choose correct options from following:");
                                    goto updateOptions;
									
                                case "2":
                                    break;
									
                                default:
                                    break;
                            }
                            break;
                    }
                }
                else
                {
                    Console.WriteLine("\n !!!!!! WRONG CHOICE.... Contact is not available with this Name.");
                    Console.WriteLine("1. Please Enter Correct Name :");
                    Console.WriteLine("2. See Contact List : ");
                    Console.WriteLine("3. Go Back to Main Menu : \n");

                    var ch = Console.ReadLine();

                    switch (ch)
                    {
                        case "1":
                            goto startUpdate;
                        case "2":
                            ShowAllContacts();
                            goto startUpdate;
                        case "3":
                            break;
                        default:
                            break;
                    }
                }
            }
            else
            {
                Console.WriteLine("\n!!!!! There is no data available to Update \n ");
            }
        }
		
		public void SearchRecord()
		{
			if(ContactBookList.Count != 0)
			{
				Console.WriteLine("\n Enter Contact Person's Name you want to see : ");
				var name = Console.ReadLine();
			
				var matchedRecords = ContactBookList.Where(p => p.Name == name);
			
				Console.WriteLine("\n----------------------------CONTACT-LIST----------------------------");
            	Console.WriteLine("\n\nId \t\t    Name \t\t\t   Mobile No \t\t   City");
            	Console.WriteLine("------------------------------------------------------------------------");
			
				if (matchedRecords.Count() == 0)
            	{
                	Console.WriteLine("\t\t\t       No Data Found           ");
            	}
				else
				{
					foreach(var person in matchedRecords)
					{

                		Console.Write(" {0,-10}", person.Id);
                		Console.Write("\t {0,-20}", person.Name);
                		Console.Write("{0,-20}", person.MobileNo);
                		Console.Write("{0,-20} \n", person.City);

            		}
            		Console.WriteLine();
				}
			}
			else
			{
				Console.WriteLine("\n !!!!! There is no data available to search .... Please Add Some data first \n");
			}
		}
    }
}

​x
 
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
​
namespace Contact_Management
{
    public class Program
    {
        public static void Main(string[] args)
        {
            bool validInput = true;
            ContactBook cb = new ContactBook();
            
            Console.WriteLine("--------Contact Management--------");
            
            while (validInput)
            {
                ContactBook.PrintOptions();
                var input = Console.ReadLine();
​
                switch (input)
                {
                    case "1":
                        cb.CreateContact();
                        break;
                    case "2":
                        cb.UpdateContact();
                        break;
                    case "3":
                        cb.DeleteContact();
                        break;
                    case "4":
                        cb.ShowAllContacts();
                        break;
                    case "5":
                        cb.SearchRecord();
                        break;
                    case "6":
                        cb.WriteToFile();
                        break;
                    case "7":
                        cb.ReadFromFile();
                        break;
                    case "8":
                        validInput = false;
                        break;
                    default:
                        validInput = false;
                        break;
                }
            }
        }
    }
​
    class Person
    {
        public string Name { get; set; }
        public int Id;
        public string MobileNo { get; set; }
        public string City { get; set; }
        
        public Person(string name, string mobileNo, string city)
        {
            // this.Id = AutoIncrementId();
            this.Name = name;
            this.MobileNo = mobileNo;
            this.City = city;
        }
    }
​
    class ContactBook
    {
        public int id = 1;
        private List<Person> contactBookList = new List<Person>();
        public List<Person> ContactBookList
        {
            get { return contactBookList; }
            set { this.contactBookList = value; }
        }
​
        public ContactBook()
        {
            ContactBookList = new List<Person>();
        }
​
        public static void PrintOptions()
        {
            Console.WriteLine("\n Choose One from following Options: \n");
            Console.WriteLine(" #1 Add Contact");
            Console.WriteLine(" #2 Update Contact ");
            Console.WriteLine(" #3 Delete Contact");
            Console.WriteLine(" #4 Show All Contacts");
            Console.WriteLine(" #5 Search Records");            
            Console.WriteLine(" #6 Save");
            Console.WriteLine(" #7 Get All Records From File");     
            Console.WriteLine(" #8 Exit \n");
        }
        
        public void CreateContact()
        {
        startInsert: Console.WriteLine("\n Enter Name :");
            var name = Console.ReadLine();
            Console.WriteLine("Enter Mobile Number :");
            var moNo = Console.ReadLine();
            Console.WriteLine("Enter City Name :");
            var city = Console.ReadLine();
​
            var contactWithSameName = ContactBookList.Where(p => p.Name == name && p.MobileNo == moNo).SingleOrDefault();
            
            if (contactWithSameName == null)
            {
                Person person = new Person(name, moNo, city);
                person.Id = AutoIncrementId();
                AddContactToList(person);
            }
            else
            {
                Console.WriteLine("\n !!!!!! Contact is already available with this Name, Please Enter Different Name Or Mobile Number :");
                goto startInsert;
            }
        }
​
        private int AutoIncrementId()
        {
            return this.id++;
        }
​
        private void AddContactToList(Person person)
        {
            ContactBookList.Add(person);
        }
​
        public void ShowAllContacts()
        {
            Console.WriteLine("\n----------------------------CONTACT-LIST----------------------------");
            Console.WriteLine("\n\nId \t\t    Name \t\t\t   Mobile No \t\t   City");
            Console.WriteLine("------------------------------------------------------------------------");
​
            if (ContactBookList.Count == 0)
            {
                Console.WriteLine("\t\t\t       No Data Found           ");
            }
            else
            {
                foreach (var person in ContactBookList)
                {
                    Console.Write(" {0,-10}", person.Id);
                    Console.Write("\t {0,-20}", person.Name);
                    Console.Write("{0,-20}", person.MobileNo);
                    Console.Write("{0,-20} \n", person.City);
                }
                Console.WriteLine();
            }
        }
​
        public void DeleteContact()
        {
            if (ContactBookList.Count != 0)
            {
            startDelete: Console.WriteLine("\n Enter name you want to delete :");
                var name = Console.ReadLine();
                var contactWithSameName = ContactBookList.Where(person => person.Name == name);
​
                if (contactWithSameName.Any())
                {
​
                    ContactBookList.RemoveAll(x => x.Name == name);
                }
                else
                {
                    Console.WriteLine("\n !!!!!! WRONG CHOICE.... Contact is not available with this Name \n");
                    Console.WriteLine("1. Please Enter Correct Name :");
                    Console.WriteLine("2. See Contact List :");
                    Console.WriteLine("3. Go Back to Main Menu : \n");
​
                    var ch = Console.ReadLine();
​
                    switch (ch)
                    {
                        case "1":
                            goto startDelete;
                        case "2":
                            ShowAllContacts();
                            goto startDelete;
                        case "3":
                            break;
                        default:
                            break;
                    }
                }
            }
            else
            {
                Console.WriteLine("\n!!!!! There is no data available to delete \n ");
            }
        }
        
        public void WriteToFile()
        {
            string json = JsonConvert.SerializeObject(ContactBookList.ToArray());
            
            
            //Method 1#
            // File.WriteAllText(@"F:\Prompt Softech\Documents\Contacts.txt",json);
            
            Console.WriteLine(json);
​
            // Method 2#
            /* using (StreamWriter file = File.CreateText(@"F:\Prompt Softech\Documents\Contacts.txt"))
            {
                JsonSerializer serializer = new JsonSerializer();
                serializer.Serialize(file, ContactBookList);
            } */
        }
​
        public void ReadFromFile()
        {
            /* 
            var json = File.ReadAllText(@"F:\Prompt Softech\Documents\Contacts.txt");
            List<Person> ContactBookList = JsonConvert.DeserializeObject<List<Person>>(json);
​
            Console.WriteLine("\n ----------------------------CONTACT-LIST----------------------------");
            Console.WriteLine("\n\nId \t\t Name \t\t   Mobile No \t\t City");
            Console.WriteLine("------------------------------------------------------------------------");
​
            if(ContactBookList.Count != 0)
            {
                foreach (var person in ContactBookList)
                {
                    Console.Write(" {0,-10}", person.Id);
                    Console.Write("\t {0,-20}", person.Name);
                    Console.Write("{0,-20}", person.MobileNo);
                    Console.Write("{0,-20} \n", person.City);
                }
                Console.WriteLine();
            }
            else
            {
                Console.WriteLine("\t\t\t No data found");
            }
            */
        }
        
        public void UpdateContact()
        {
            if (ContactBookList.Count != 0)
            {
            startUpdate: Console.WriteLine("\n Enter existing name you want to update");
                var oldName = Console.ReadLine();
                
                var contactWithSameName = ContactBookList.Where(person => person.Name == oldName);
​
                if (contactWithSameName.Any())
                {
​
                updateOptions: Console.WriteLine("\n What you want to update, Choose from following :");
                    Console.WriteLine(" 1. Name");
                    Console.WriteLine(" 2. Mobile No.");
                    Console.WriteLine(" 3. City \n");
                    var updateInput = Console.ReadLine();
                    
                    /* local functionn supported in c# 7.0,but i have c# 6.0,so its not supported..
​
                        void updateFunction(string s)
                        {
                            foreach (var person in contactWithSameName)
                            {
                                s == 1 ? person.Name = newName : 
                                s == 2 ? person.MobileNo = newMobileNo :
                                s == 3 ? person.City = newCity;
                            }
                        } 
                     */
​
                    switch (updateInput)
                    {
                        case "1":
                            Console.WriteLine("\n Enter new Name :");
                            var newName = Console.ReadLine();
                            //updateFunction("1");
                            foreach (var person in contactWithSameName)
                            {
                                person.Name = newName;
                            }
                            break;
                            
                        case "2":
                            Console.WriteLine("\n Enter new Mobile No :");
                            var newMobileNo = Console.ReadLine();
                            foreach (var person in contactWithSameName)
                            {
                                person.MobileNo = newMobileNo;
                            }
                            break;
                            
                        case "3":
                            Console.WriteLine("\n Enter new City :");
                            var newCity = Console.ReadLine();
                            foreach (var person in contactWithSameName)
                            {
                                person.City = newCity;
                            }
                            break;
                        
                        default:
                            Console.WriteLine("\n\t !!!!! WRONG CHOICE : ");
                            Console.WriteLine("\t  1. Do you want to Continue? ");
                            Console.WriteLine("\t  2. Go Back to Main Menu : \n");
                            var ch = Console.ReadLine();
​
                            switch (ch)
                            {
                                case "1":
                                    Console.WriteLine("\n >>>>> Please choose correct options from following:");
                                    goto updateOptions;
                                    
                                case "2":
                                    break;
                                    
                                default:
                                    break;
                            }
                            break;
                    }
                }
                else
                {
                    Console.WriteLine("\n !!!!!! WRONG CHOICE.... Contact is not available with this Name.");
                    Console.WriteLine("1. Please Enter Correct Name :");
                    Console.WriteLine("2. See Contact List : ");
                    Console.WriteLine("3. Go Back to Main Menu : \n");
​
                    var ch = Console.ReadLine();
​
                    switch (ch)
                    {
                        case "1":
                            goto startUpdate;
                        case "2":
                            ShowAllContacts();
                            goto startUpdate;
                        case "3":
                            break;
                        default:
                            break;
                    }
                }
            }
            else
            {
                Console.WriteLine("\n!!!!! There is no data available to Update \n ");
            }
        }
        
        public void SearchRecord()
        {
            if(ContactBookList.Count != 0)
            {
                Console.WriteLine("\n Enter Contact Person's Name you want to see : ");
                var name = Console.ReadLine();
            
                var matchedRecords = ContactBookList.Where(p => p.Name == name);
            
                Console.WriteLine("\n----------------------------CONTACT-LIST----------------------------");
                Console.WriteLine("\n\nId \t\t    Name \t\t\t   Mobile No \t\t   City");
                Console.WriteLine("------------------------------------------------------------------------");
            
                if (matchedRecords.Count() == 0)
                {
                    Console.WriteLine("\t\t\t       No Data Found           ");
                }
                else
                {
                    foreach(var person in matchedRecords)
                    {
​
                        Console.Write(" {0,-10}", person.Id);
                        Console.Write("\t {0,-20}", person.Name);
                        Console.Write("{0,-20}", person.MobileNo);
                        Console.Write("{0,-20} \n", person.City);
​
                    }
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("\n !!!!! There is no data available to search .... Please Add Some data first \n");
            }
        }
    }
}
​

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