DataGridView in the tabcontrol displays empty rows

Hi,

try this,

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
  {
 
  if (e.KeyChar == (char)13)
  {
  dateTimePicker2.Focus(); 
  DataSet _dataset = new DataSet();
  OleDbDataAdapter oleDbAdapter1 = new OleDbDataAdapter();
  oleDbAdapter1.SelectCommand = new OleDbCommand();
  oleDbAdapter1.SelectCommand.Connection = conn;
  oleDbAdapter1.SelectCommand.CommandText = "SELECT * from Avt  where Brdog=?";
  oleDbAdapter1.SelectCommand.Parameters.AddWithValue("@Brdog", textBox1.Text);
  oleDbAdapter1.Fill(_dataset, "Avt");
  dataGridView1.DataSource = _dataset.Tables["Avt"].DefaultView;
  conn.Close();
  }
  }