c# ciscenje iz memorije

Code:
                DataTable AAADataTable = new DataTable();
        private void populate_datagrid()
        {
            // Inicijaliziraj Lokacije2.mdb Pass: afmlb
               string connection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= Lokacije2.mdb;Jet OLEDB:Database Password=AAA";
            OleDbConnection AAAConnection = new OleDbConnection();
            AAAConnection.ConnectionString = connection;
            AAAConnection.Open();

            OleDbDataAdapter AAADataAdapter = new OleDbDataAdapter("Select Lokacija from lok", AAAConnection);

            OleDbCommandBuilder AAACommandBuilder = new OleDbCommandBuilder(AAADataAdapter);

            // Populate DataGrid
            AAADataAdapter.Fill(AAADataTable);
            AAADataGrid.DataSource = AAADataTable;
            AAAConnection.Close();
        }


        private void search_datagrid(string search)
        {
            DataView dv = new DataView(AAADataTable);
            dv.RowFilter="Lokacija like '%"+search+"%'";
            AAADataGrid.DataSource=dv;
        }

        private void btn_LokacijaSearch_Click(object sender, System.EventArgs e)
        {
              search_datagrid(txtAAASearch.Text);
        }

        private void txtAAASearch_TextChanged(object sender, System.EventArgs e)
        {
              search_datagrid(txtAAASearch.Text);
        }