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This is a simple C# program to implement phoneBook. If you are a c# beginner or want to start learning the c# programming language, then this program will help you to understand the basics of c# programming. In this program, I will explain how to write a c# program to implement phoneBook.
Copy the below c# program and execute it in your Microsoft Visual Studio IDE (Integrated Development Environment ). At the end of this program, I have shared the output of program this program.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | using System; using System.Collections; using System.IO; class PhoneBook { static void Main(string[] arg) { Hashtable tab = new Hashtable(); string fileName; if { (arg.Length > 0) fileName = arg[0]; } else { fileName = "phoneBook.txt"; } StreamReader r = File.OpenText(fileName); string line = r.ReadLine(); while (line != null) { int pos = line.IndexOf('='); string name = line.Substring(0, pos).Trim(); long phone = Convert.ToInt64(line.Substring(pos + 1)); tab[name] = phone; line = r.ReadLine(); } r.Close(); for (; ; ) { Console.Write("Name : "); string name = Console.ReadLine().Trim(); if (name == "") break; object phone = tab[name]; if (phone == null) Console.WriteLine("-- Not Found in Phone Book"); else Console.WriteLine(phone); } } } |
Name : Ramesh
1236547891
Name : Ravi
— Not Found in PhoneBook
Tags: c# - Phone Directory Example, Create an application in which a user can enter a phone book, How to Create Simple Phone Book Application C#, Implement a Phone Directory, Phone Book in C#, tree - Data structure for Phonebook
