Here I will explain how to create a login form with SQL Server. Before this I explained Creating Login Form with SQL Server in Window Form.
Step 1: login form
Drag and down two Labels (for username and password) and two text boxes and a Button (for submit) onto a Window Forms form and change their name to "usrtxt" and "passtxt".
![username and password]()
Step 2: Database table
![database table]()
Step 3: The code for the button click of the button is as in the following:
![button click]()
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace First_Csharp_app
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
if (!(usertxt.Text == string.Empty))
{
if (!(passtxt.Text == string.Empty))
{
String str = "server=MUNESH-PC;database=windowapp;UID=sa;password=123";
String query = "select * from data where username = '" + usertxt.Text + "'and password = '" + this.passtxt.Text + "'";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(query, con);
SqlDataReader dbr;
con.Open();
dbr = cmd.ExecuteReader();
int count = 0;
while (dbr.Read())
{
count = count + 1;
}
if (count == 1)
{
MessageBox.Show("username and password is correct");
}
else if (count > 1)
{
MessageBox.Show("Duplicate username and password", "login page");
}
else
{
MessageBox.Show(" username and password incorrect", "login page");
}
}
else
{
MessageBox.Show(" password empty", "login page");
}
}
else
{
MessageBox.Show(" username empty", "login page");
}
// con.Close();
}
catch (Exception es)
{
MessageBox.Show(es.Message);
}
}
}
}
Step 4: Run your application
If the username and/or password is not correct:
![Run your application]()
If the username and password are correct: