public static string AddPermissao(PermissaoViewModel viewModel)
        {
            try
            {
                //#region Connection
                //Connection connection = Connection.Instance;
                //connection.ConnectionString = VisualWebPart1._connectionString;
                //connection.User = VisualWebPart1._username;
                //connection.Password = VisualWebPart1._password;
                //#endregion

                IApplicationFacade application = new ApplicationFacade();
                application.AdicionarPermissaoSite(viewModel.site, viewModel.nome, viewModel.nivelPermissao);
                //var list = new List<Site>();

                //SPSecurity.RunWithElevatedPrivileges(delegate()
                //{
                //    using (SPWeb web = new SPSite(SPContext.Current.Site.ID).OpenWeb(String.Concat(@"/", viewModel.site)))
                //    {
                //        var anterior = web.AllowUnsafeUpdates;
                //        web.AllowUnsafeUpdates = true;

                //        //Criar grupo:
                //        SPGroup group = null;
                //        try
                //        {
                //            group = web.SiteGroups[viewModel.nome];
                //        }
                //        catch (Exception)
                //        {
                //            if (group == null)
                //            {
                //                web.SiteGroups.Add(viewModel.nome, SPContext.Current.Web.CurrentUser, web.Author, "Your Group Description");
                //                group = web.SiteGroups[viewModel.nome];
                //            }
                //        }


                //        // Adicionar permissão:
                //        SPRoleType type = SPRoleType.None;
                //        switch (viewModel.nivelPermissao)
                //        {
                //            case "Contribuição": type = SPRoleType.Contributor; break;
                //            case "Controle Total": type = SPRoleType.Administrator; break;
                //            case "Leitura": type = SPRoleType.Reader; break;
                //            case "Edição": type = SPRoleType.Editor; break;
                //            case "Designer": type = SPRoleType.WebDesigner; break;
                //        }
                //        SPRoleDefinition roleDefinition = web.RoleDefinitions.GetByType(type);

                //        SPRoleAssignment roleAssignment = new SPRoleAssignment(group);
                //        roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
                //        web.RoleAssignments.Add(roleAssignment);
                //        web.Update();
                //        web.AllowUnsafeUpdates = !anterior;
                //    }
                //});


                return(JsonConvert.SerializeObject(
                           viewModel, new JsonSerializerSettings
                {
                    ContractResolver = new CamelCasePropertyNamesContractResolver()
                }));
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }