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Here i will explain a how to create a login form with Sql Server. before this i explain that to connect window form with database(sql server).
Step(1): login form
drag and down two lable (for username and password) and two text box and a button(submit) on window form and change their name as usrtxt and passtxt.
Step(2):database table
Step(3): Coding on button click
click on button and write this coding
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(3): Run your applicationif username and password is not correct
if username and password is correct
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