public void Search() { Students.Clear(); if (string.IsNullOrWhiteSpace(SearchFilter)) { foreach (var student in _academy.GetAllStudents()) { Students.Add(student); } } else { foreach (var student in _academy.GetByStudentName(SearchFilter)) { Students.Add(student); } foreach (var student in _academy.GetByStudentCity(SearchFilter)) { Students.Add(student); } } }