Добавление записи из БД

private void button2_Click(object sender, EventArgs e)
        {
 
            SqlDataAdapter da = new SqlDataAdapter("Select [NUMBER], [LASTNAME], [FIRSTNAME], [SECONDNAME], [PROFESSION] from dbo.WORKER where [NUMBER] LIKE'" + textBox1.Text + "%'", _MyClass._prm.conn);
            DataSet ds = new DataSet();
            da.Fill(ds, "dbo.WORKER");
            dataGridView1.DataSource = ds.Tables["dbo.WORKER"];            
            dataGridView1.AutoGenerateColumns = true;
 
        }

mylib ml = new mylib();
 
            ml.connectHandler.Open();
            ml.commandHandler.CommandText = "SELECT * FROM Objects";
 
            SqlCeDataReader reader = ml.commandHandler.ExecuteReader();
            
            while (reader.Read()){
                string[] row1 = { reader.GetString(0) };
                listObjects.Items.Add("").SubItems.AddRange(row1);
            }
            ml.connectHandler.Close();

class mylib{
        public string connectString;
        public SqlCeConnection connectHandler;
        public SqlCeCommand commandHandler;
 
        public mylib() {
            data_base_string();
        }
 
        private void data_base_string() {
            string str = Path.GetDirectoryName(Application.ExecutablePath);
            str = str.Replace("\\bin\\Debug", "");
            str = str.Replace(@"\", "\\");
            string path = "Data Source=" + str + @"\Database1.sdf";
            this.connectString = path;//"Data Source=D:\\programming\\Visual Studio 2010\\C#\\WindowsFormsApplication1\\WindowsFormsApplication1\\Database1.sdf";
 
            string cnt_string = this.connectString;
            SqlCeConnection ccnt = new SqlCeConnection(cnt_string);
            SqlCeCommand ccmd = new SqlCeCommand();
 
            this.connectHandler = ccnt;
            this.commandHandler = ccmd;
            this.commandHandler.Connection = ccnt;
 
        }
    }