Search a record in DataGridView

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 textBox1_TextChanged(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(@
            "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Karthik\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Database1.mdf;Integrated Security=True;User Instance=True");
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter("select * from Table1 where Name LIKE '" + textBox1.Text + "%'", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;
            con.Close();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(@
            "Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Karthik\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Database1.mdf;Integrated Security=True;User Instance=True");
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter("select * from Table1", con);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;
            con.Close();
        }
    }
}