private void btnGetDatabase_Click(object sender, EventArgs e) { Database database; if (rdbUseSqlServer.Checked) { database = new SqlServerDatabase(); } else { database = new OleDBDatabase(); } DbCommand command = database.Command; // now, we can do something, like: //command.CommandType = CommandType.Text; //command.CommandText = "SELECT * FROM Customers"; //command.Connection.Open(); //DbDataReader reader = command.ExecuteReader(); //reader.Close(); //command.Connection.Close(); }