Tuesday, 8 April 2014

Creating Login Form with Sql Server in window form

                                     
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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 application
if username and password is not correct
if username and password is correct



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