static void Main(string[] args) { int choice; EmployeeDomain emp = new EmployeeDomain(); BusinessUnitDomain unit = new BusinessUnitDomain(); EmployeeLeaveDomain leave = new EmployeeLeaveDomain(); AssignProjectDomain assign = new AssignProjectDomain(); ProjectDomain project = new ProjectDomain(); do { Console.WriteLine("Enter Choice:"); choice = Convert.ToInt32(Console.ReadLine()); switch (choice) { case 1: emp.addEmployees(); break; case 2: emp.deleteEmployees(); break; case 3: emp.updateEmployees(); break; case 4: unit.addUnits(); break; case 5: unit.updateUnits(); break; case 6: project.addProjects(); break; case 7: leave.addLeave(); break; case 8: leave.deleteLeave(); break; case 9: assign.assignProject(); break; default: Console.WriteLine("Exit"); break; } } while (choice != 10); }