I have the following json response 

```
{
  "Id": "1234",
  "Name": "Test",
  "Orders": [
    {
      "OrderId": "87654",
      "OrderDetails": {
        "OrdId": "1234",
        "Name": "Desk"
      }
    },
    {
      "OrderId": "54213",
      "OrderDetails": {
        "OrdId": "4321",
        "Name": "Table"
      }
    }
  ]
}

```

I want to search the list of orders to see if there is an OrderId of 87654. 
I can do with an array , but how can I do it with Linq ?