向Moss网站权限中中添加新用户

Moss 07中给网站权限里新增用户

 SPRoleDefinition oRole = newWeb.RoleDefinitions["参与讨论"];
  SPRoleAssignment oRoleAss = new SPRoleAssignment("NT Authority\\Authenticated Users", 
"", "NT Authority\\Authenticated Users", "");
   oRoleAss.RoleDefinitionBindings.Add(oRole);
    _SpWeb.RoleAssignments.Add(oRoleAss);