public teacher getTeacher(string id)
{
teacher tchr = database.teachers.First(data => data.idteachers == id);
return(tchr);
}
public void deleteTeacher(string id)
{
teacher tchr = database.teachers.First(data => data.idteachers == id);
database.teachers.Remove(tchr);
}
public void insertTeacher(ref teacher tchr)
{
database.teachers.Add(tchr);
database.SaveChanges();
}
