public void T6_UpdateAll() { //Arrange DateTime Date1 = new DateTime(2016, 08, 01); Student student1 = new Student("Jon", "Jone", "*****@*****.**", "/img/jon.jpg", Date1); student1.Save(); Student currentStudent = new Student("Jon", "Jone", "*****@*****.**", "/img/jon.jpg", Date1, student1.GetId()); //Act student1.UpdateAll(currentStudent); // student1.UpdateAll(currentStudent); // static void .. error CS0176: Member 'Student.UpdateAll(Student)' cannot be accessed with an instance reference; qualify it with a type name instead //Assert Assert.Equal(currentStudent, student1); }