SIMPLE DATA RETRIEVING FROM SQL DB

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.SqlServerCe;

namespace sdf
{
    public partial class Form1 : Form
    {
        SqlCeConnection connection = new SqlCeConnection();
        string DB_path;
        SqlCeDataAdapter adp;
        DataSet ds = new DataSet();
        public Form1()
        {
            InitializeComponent();
            DB_path = Application.StartupPath.ToString();
            connection.ConnectionString = "data source=" + DB_path + "\\unitsdb.sdf";
        }      

        private void button1_Click(object sender, EventArgs e)
        {
            dataGridView1.Rows.Clear();
            adp = new SqlCeDataAdapter("SELECT [ fldUnitName], fldCoefficient FROM tblAcceleration WHERE([ fldUnitName] = '"+textBox1.Text+"')", connection);
            adp.Fill(ds, "s");
            dataGridView1.DataSource = ds.Tables["s"];
        }
    }
}