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My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.My mobile number here in the Philippines is 09173084360. My telephone number at home here in Bacolod City, Negros Occidental Philippines is +63 (034) 4335675.
Here in Bacolod City, Negros Occidental I also accepting computer repair, web development using WordPress, Computer Networking, and Arduino Project development at a very affordable price. My personal website is http://www.jakerpomperada.comMy programming website is http://www.jakerpomperada.blogspot.comI am also a book author you can purchase my books on computer programming and information technology in the following links below.https://www.unlimitedbooksph.com/
Sample Program Output
Program Listing
login.txt
jake jake
admin admin
tom abc
iya iya
jacob jacob
allie allie
UserManager.cs
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
namespace LoginSystem
{
class UserManager
{
public void Load(string filename)
{
Debug.Assert(!string.IsNullOrEmpty(filename));
Debug.Assert(File.Exists(filename));
string[] lines = File.ReadAllLines(filename);
foreach (string line in lines)
{
string[] tokens = line.Split('\t');
if (tokens.Length == 2)
credentials.Add(tokens[0], tokens[1]);
else
Debug.WriteLine("Read invalid line: {}", line);
}
}
public bool ValidateUser(string user, string password)
{
if (!credentials.ContainsKey(user))
return false;
else
return credentials[user] == password;
}
IDictionary<string, string> credentials = new Dictionary<string, string>();
}
}
ConsoleUtils.cs
using System;
using System.Text;
namespace LoginSystem
{
static class ConsoleUtils
{
public static string ReadPassword(char display)
{
StringBuilder sb = new StringBuilder();
while (true)
{
ConsoleKeyInfo key = Console.ReadKey(true);
if (key.Key == ConsoleKey.Enter)
break;
sb.Append(key.KeyChar);
Console.Write(display);
}
return sb.ToString();
}
}
}
Main.cs
using System;
namespace LoginSystem
{
class Program
{
static void Main(string[] args)
{
UserManager mgr = new UserManager();
mgr.Load("login.txt");
Console.Write("\n\n");
Console.Write("\t\tLogin System in C#\n\n");
Console.Write("\tCreated By Jake Rodriguez Pomperada\n");
Console.Write("\n");
Console.Write("\tEnter Username : ");
string user = Console.ReadLine();
Console.Write("\tEnter Password : ");
string pw = ConsoleUtils.ReadPassword('$');
Console.WriteLine("\n");
if (mgr.ValidateUser(user, pw))
Console.WriteLine("\tLogin successful to the system.");
else
Console.WriteLine("\tEither username or password is wrong. Try Again.");
Console.ReadKey();
}
}
}
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