Program to saving data to a database

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.SqlClient;
namespace WindowsFormsApplication1
{
  public partial class Form1 : Form
{
  public Form1()
{
InitializeComponent();
}private void button1_Click(object sender, EventArgs e)
{
SqlConnection cn =new SqlConnection("PASTE CONNECTION STRING HERE");

cn.Open();
SqlCommand cmd = new SqlCommand("insert into emp values ('"+textBox1.Text+"', '"+textBox2.Text+"', "+textBox3.Text+")",cn); 

cmd.ExecuteNonQuery();
MessageBox.Show(" your entries are saved into the database");
}
}

connection string is found in database properties

example of a connection string


("Data Source=.\\SQLEXPRESS;AttachDbFilename=C:\\Users\\manish\\Documents\\niist.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True")