P4: Write a C Sharp program to display records in text boxes of windows Form through Microsoft SQL Server 2008's database by connecting via Windows Authentication.

Assumptions:

Server Name: MSSQLSERVER2008
Database: project
Table: login

Data in Table:

id	username	password
1	pabitra	dangol

Form Design

Source Code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data; //used for database connection
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient; //used for database connection

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            string connectionString = null;
            SqlConnection sqlCnn;
            SqlCommand sqlCmd;
            SqlDataAdapter adapter = new SqlDataAdapter();
            DataSet ds = new DataSet();
            int i = 0;
            string sql = null;

            //connecting SQL Server 2008 using Windows Authentication Mode via C Sharp
            connectionString = "Data Source=.\\MSSQLSERVER2008; Initial Catalog=project;Integrated Security=SSPI";
         
            sql = "Select * from login";

            sqlCnn = new SqlConnection(connectionString);
            try
            {
                sqlCnn.Open();
                sqlCmd = new SqlCommand(sql, sqlCnn);
                adapter.SelectCommand = sqlCmd;
                adapter.Fill(ds);
             
                for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
                {
                    txtid.Text = Convert.ToString(ds.Tables[0].Rows[i].ItemArray[0]);
                    txtusername.Text = Convert.ToString(ds.Tables[0].Rows[i].ItemArray[1]);
                    txtpassword.Text = Convert.ToString(ds.Tables[0].Rows[i].ItemArray[2]);
                    MessageBox.Show(ds.Tables[0].Rows[i].ItemArray[0] + " - " + ds.Tables[0].Rows[i].ItemArray[1] + " - " + ds.Tables[0].Rows[i].ItemArray[2]);
                }
                adapter.Dispose();
                sqlCmd.Dispose();
                sqlCnn.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Can not open connection ! ");
            }

        }
    }
}

OUTPUT