Retrive data into Datagridview table,when there is a search from textbox.

namespace Config_admin
{
    public partial class Form2 : Form
    {
        SqlConnection con;
        SqlCommand com;
        SqlDataReader rdr;
        DataSet ds;
        SqlDataAdapter da;
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            con = new SqlConnection("Data Source=CBP\\SQLEXPRESS;Initial Catalog=ECG;Integrated Security=True");
            con.Open();
            com = new SqlCommand("select middle,last from  Table2 where first= '"+ textBox1.Text.Trim()+"'",con);
            rdr = com.ExecuteReader();
            bool temp = false;
            while (rdr.Read())
            {

                //textBox1.Text = rdr.GetString(0);
                comboBox1.Text = rdr[0].ToString().Trim();//ToString();// GetString(1);
                comboBox2.Text = rdr[1].ToString().Trim();
                //textBox4.Text = rdr.GetString(3);
                //textBox5.Text = rdr.GetString(4);
                //textBox6.Text = rdr.GetString(5);
                //textBox7.Text = rdr.GetString(6);
                //textBox8.Text = rdr.GetString(7);
                //textBox9.Text = rdr.GetString(8);
                //textBox10.Text = rdr.GetString(9);
                temp = true;

            }
            
            if (temp == false)
                MessageBox.Show("not found");
            con.Close();

            con.Open();
            ds = new DataSet();
            da = new SqlDataAdapter("select * from Table2", con);
            da.Fill(ds, "Table2");
            con.Close();


        }
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }