private void Manp_UserPermissions_Shown(object sender, EventArgs e) { Operation <List <PermissionMasterView> > op_PermissionMasters = OperationHandler.GetUserPermissions(UserId); if (!op_PermissionMasters.Successful) { OnLoadError(op_PermissionMasters.Fail); return; } Permissions = op_PermissionMasters.Value; treeListPermissions.DataSource = Permissions; }