![using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
using System.Windows.Forms;
namespace Login
{
class Login
{
//decalre properties
public string Username { get; set; }
public string Userpassword { get; set; }
//intialise
public Login(string user, string pass)
{
this.Username = user;
this.Userpassword = pass;
}
//validate string
private bool StringValidator(string input)
{
string pattern = "[^a-zA-Z]";
if(Regex.IsMatch(input,pattern))
{
return true;
}
else
{
return false;
}
}
//validate integer
private bool IntegerValidator(string input)
{
string pattern = "[^0-9]";
if(Regex.IsMatch(input,pattern))
{
return true;
}
else
{
return false;
}
}
//clear user inputs
private void ClearTexts(string user, string pass)
{
user = String.Empty;
pass = String.Empty;
}
//method to check if eligible to be logged in
internal bool IsLoggedIn(string user, string pass)
{
//check user name empty
if (string.IsNullOrEmpty(user))
{](https://image.slidesharecdn.com/logincode-200826170947/85/Logincode-1-320.jpg)
Logincode
- 1. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Text.RegularExpressions; using System.Windows.Forms; namespace Login { class Login { //decalre properties public string Username { get; set; } public string Userpassword { get; set; } //intialise public Login(string user, string pass) { this.Username = user; this.Userpassword = pass; } //validate string private bool StringValidator(string input) { string pattern = "[^a-zA-Z]"; if(Regex.IsMatch(input,pattern)) { return true; } else { return false; } } //validate integer private bool IntegerValidator(string input) { string pattern = "[^0-9]"; if(Regex.IsMatch(input,pattern)) { return true; } else { return false; } } //clear user inputs private void ClearTexts(string user, string pass) { user = String.Empty; pass = String.Empty; } //method to check if eligible to be logged in internal bool IsLoggedIn(string user, string pass) { //check user name empty if (string.IsNullOrEmpty(user)) {
- 2. MessageBox.Show("Enter the user name!"); return false; } //check user name is valid type else if (StringValidator(user) == true) { MessageBox.Show("Enter only text here"); ClearTexts(user,pass); return false; } //check user name is correct else { if (Username != user) { MessageBox.Show("User name is incorrect!"); ClearTexts(user,pass); return false; } //check password is empty else { if (string.IsNullOrEmpty(pass)) { MessageBox.Show("Enter the passowrd!"); return false; } //check password is valid else if (IntegerValidator(pass) == true) { MessageBox.Show("Enter only integer here"); return false; } //check password is correct else if(Userpassword!=pass) { MessageBox.Show("Password is incorrect"); return false; } else { return true; } } } } } } CompleteCsharp
- 3. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Login { public partial class MainForm : Form { public MainForm() { InitializeComponent(); } //Enter code here for your version of username and userpassword Login login = new Login("admin", "1234"); private void button1_Click(object sender, EventArgs e) { //define local variables from the user inputs string user = nametxtbox.Text; string pass = pwdtxtbox.Text; //check if eligible to be logged in if(login.IsLoggedIn(user,pass)) { MessageBox.Show("You are logged in successfully"); } else { //show default login error message MessageBox.Show("Login Error!"); } } private void linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventAr gs e) { //enter your code for forget password case MessageBox.Show("Under development"); } private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventAr gs e) { //Enter your code for registration form of your choice MessageBox.Show("Under development"); } } }