private void UpdateStudent() { Console.WriteLine("--- Update Student ---"); Console.WriteLine("Enter Student ID to modify: "); InputID(); newStu = bl.GetStudentByID(id); if (newStu == null) { Console.WriteLine("Student not found!"); return; } else { Console.WriteLine("[optional] Enter Student Name: "); string name = Console.ReadLine(); if (name == null) { Console.WriteLine("Student Name is null!"); } else { newStu.StudentName = name; } Console.WriteLine("[optional] Enter Standard ID: "); strID = Console.ReadLine(); id = Convert.ToInt32(strID); if (strID == null) { Console.WriteLine("Standard ID is null!"); } else { newStu.StandardId = id; } bl.UpdateStudent(newStu); Console.WriteLine("Student has been updated!"); } Continue(); }