static void Main(string[] args) { Student s1 = new Student(); try { s1.Readdata(); } catch (Myexception ex) { A.WriteLine("Input for Semester is Inappropriate"); A.WriteLine("Enter accurate credentials this time\n"); try { s1.Readdata(); } catch (Exception e) { A.WriteLine("Inappropriate input"); A.WriteLine("Enter accurate credentials this time\n"); s1.Readdata(); } } catch (FormatException f) { A.WriteLine("Inappropriate input"); A.WriteLine("Enter accurate credentials this time\n"); try { s1.Readdata(); } catch (Myexception a) { A.WriteLine("Inappropriate input"); A.WriteLine("Enter accurate credentials this time\n"); s1.Readdata(); } } catch (Exception e) { A.WriteLine("Inappropriate input"); A.WriteLine("Enter accurate credentials this time\n"); s1.Readdata(); } finally { s1.Dispalydata(); } }