public List <TeacherModel> GetAllTeachers() { DataTable dt = new DataTable(); using (OleDbCommand command = new OleDbCommand()) { dt = GetMultipleQuery(TeacherStringsInner.GetAllTeachers()); } List <TeacherModel> arrTeacher = new List <TeacherModel>(); foreach (DataRow ms in dt.Rows) { arrTeacher.Add(TeacherModel.ToObject(ms)); } return(arrTeacher); }