public Grades GradeByStudentAndCourseID(int sid, int cid)
{
Grades grade = ctx.Grades.Where(x => x.StudentID == sid && x.CourseID == cid).FirstOrDefault();
return(grade);
}
public void RemoveGrade(Grades grade)
{
ctx.Grades.Attach(grade);
ctx.Grades.Remove(grade);
ctx.SaveChanges();
}
public void UpdateGrade(Grades grade)
{
ctx.Entry(grade).State = EntityState.Modified;
ctx.SaveChanges();
}
public void InsertorUpdateGrade(Grades grade)
{
ctx.Grades.Add(grade);
ctx.SaveChanges();
}