Keep connection always open for datatable twoway bind? - wpf

Question

I'm working on a WPF project which includes update/delete/insert operation on many tables. For simplicity, I use a datagrid for each table. The users can operate on these tables directly. Once done, click a button, the tables in database get updated. Twoway bind is perfect in this case. Below code seems working fine.
However, one thing I do not like is: the _DBConnection is always open. It is closed until the form exists. Usually, I always open connection whenever I need to, use it, close it immediately.
So, my question is: is below code the correct way to do the twoway bind?
thanks
public partial class MainWindow : Window
{
private OleDbConnection _DBConnection;
private OleDbDataAdapter _DataAdapterAdmin;
private DataSet _DataSetAdmin;
public MainWindow()
{
InitializeComponent();
}
private void InitAdminGrid()
{
string cmd = "SELECT * FROM Admin ORDER BY LastName";
_DataAdapterAdmin = new OleDbDataAdapter(cmd, _DBConnection);
_DataSetAdmin = new DataSet();
_DataAdapterAdmin.Fill(_DataSetAdmin);
dgAdministration.BeginInit();
dgAdministration.DataContext = _DataSetAdmin.Tables[0];
dgAdministration.Items.Refresh();
dgAdministration.EndInit();
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
string connectionString = clsDataAccess.GetConnectionString();
_DBConnection = new OleDbConnection(connectionString);
_DBConnection.Open();
InitAdminGrid();
}
private void btnStart_Click(object sender, RoutedEventArgs e)
{
try
{
OleDbCommandBuilder cmd = new OleDbCommandBuilder(_DataAdapterAdmin);
_DataAdapterAdmin.Update(_DataSetAdmin);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Exception", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
private void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (_DBConnection != null)
{
_DBConnection.Close();
_DBConnection.Dispose();
}
}
}