public Choices gramaticadocente(string select) { conexion_base based = new conexion_base(); Choices lista_docente = new Choices(); try { based.query.CommandText = select; based.conexiondb(); based.conexion.Open(); based.query.Connection = based.conexion; based.consultar = based.query.ExecuteReader(); while (based.consultar.Read()) { lista_docente.Add(based.consultar.GetString(0)); } } catch (Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); //throw; } finally { based.conexion.Close(); } return(lista_docente); }