Компонент DataGridView не заполняется

private void button1_Click(object sender, EventArgs e) // Просмотр результатов
{
a = comboBox1.Text;
String[] words = a.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
OleDbConnection dbCon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\MyDB.mdb;Persist Security Info=False");
if (comboBox1.SelectedIndex != -1)
{
dbCon.Open();
OleDbDataAdapter dbAdapter = new OleDbDataAdapter("SELECT Registry.Quest, Registry.ChtoOtvetil, Registry.PravOtvet FROM Registry WHERE (((Registry.Family)='+ words[0] +') AND ((Registry.Namee)='+ words[1] +') AND ((Registry.SurName)='+ words[2] +') AND ((Registry.Speciality)='+ words[3] +') AND ((Registry.Otdel)='+ words[4] +') AND ((Registry.DataTest)='+ words[5].ToString() +') AND ((Registry.NameTest)='+ words[6] +') AND ((Registry.TypeTest)='+ words[7] +'));", dbCon);
DataTable dataTable = new DataTable();
dbAdapter.Fill(dataTable);
dataGridView1.DataSource = dataTable;
dataGridView1.Columns[0].HeaderText = "Вопрос";
dataGridView1.Columns[1].HeaderText = "Что ответил";
dataGridView1.Columns[2].HeaderText = "Правильный ответ";
dbCon.Close();
}
if (comboBox1.SelectedIndex == -1)
{
MessageBox.Show("Не выбран результат для просмотра результатов.");
return;
}
}