If a user provides three times wrong login credentials then the login form will be closed.

Satyapriyanayak
Posted by Satyapriyanayak under C# category on | Points: 40 | Views : 1080
Here we will know if a user provides three times wrong login credentials then the login form will be closed.


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace Invalid_login_three_times
{
public partial class Form1 : Form
{
string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
OleDbCommand com;
OleDbDataAdapter oledbda;
DataSet ds;
DataTable dt;
string str;
string s1;
int Counter=0;
int i = 0;
int j = 0;

public Form1()
{
InitializeComponent();
}

private void btn_login_Click(object sender, EventArgs e)
{
if ((txt_userid.Text == "") && (txt_password.Text==""))
{
MessageBox.Show("Userid and Password cannot be blank");
txt_userid.Focus();
return;
}

Counter = Counter + 1;
if ((Counter <= 3))
{
j = dt.Rows.Count - 1;
for (i = 0; i <= j; i++)
{
if ((txt_userid.Text == dt.Rows[i].ItemArray[0].ToString() & txt_password.Text == dt.Rows[i].ItemArray[1].ToString()))
{
MessageBox.Show("Userid and Password are correct");
this.Close();
}
else
{
s1 = Convert.ToString(3 - Counter);

}
}
MessageBox.Show("Userid or Password are incorrect! You have " + s1 + " tries left.");
}

else
{
MessageBox.Show("Userid or Password are incorrect! You have no attempts left");
Application.Exit();
}
clear();
}

void clear()
{
txt_userid.Text = "";
txt_password.Text = "";
}

private void Form1_Load(object sender, EventArgs e)
{
OleDbConnection con = new OleDbConnection(ConnectionString);
try
{
con.Open();
str = "select * from login";
com = new OleDbCommand(str, con);
oledbda = new OleDbDataAdapter(com);
ds = new DataSet();
oledbda.Fill(ds, "login");
con.Close();
dt = ds.Tables["login"];
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}

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