private static void ClearDb()
{
StudentsContext studentContext = new StudentsContext();
DbSet <Mark> marks = studentContext.Set <Mark>();
List <Mark> marksAsList = marks.ToList();
foreach (Mark mark in marksAsList)
{
marks.Remove(mark);
}
DbSet <Student> students = studentContext.Set <Student>();
List <Student> studentsAsList = studentContext.Set <Student>().ToList();
foreach (Student student in studentsAsList)
{
students.Remove(student);
}
DbSet <School> schools = studentContext.Set <School>();
List <School> schoolsAsList = schools.ToList();
foreach (School school in schoolsAsList)
{
schools.Remove(school);
}
studentContext.SaveChanges();
}