Rest Form Settings by programmatically

using (SPSite site = new SPSite("SiteURL"))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    SPList projectGeneral = web.Lists["ListName"];
                    for (int i = 0; i < projectGeneral.Fields.Count;i++ )
                        try
                        {
                            Console.WriteLine(projectGeneral.Fields[i].Title);
                            projectGeneral.Fields[i].ShowInNewForm = null;
                            projectGeneral.Fields[i].ShowInDisplayForm = null;
                            projectGeneral.Fields[i].ShowInEditForm = null;
                            projectGeneral.Fields[i].ShowInViewForms = null;                          
                            projectGeneral.Fields[i].Update();
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("Error  : " + ex.Message);
                        }
                    Console.WriteLine("Press Enter Key");
                    Console.ReadLine();
                }
            }