Deserialize this XML File and getting data

I have this XML File:

<readyGrid>
<gridRows>
<gridRow id="0">
<gridCol id="1">N.Doc.</gridCol>
<gridCol id="2">N.Doc. solo numero</gridCol>
<gridCol id="3">Data</gridCol>
<gridCol id="4">Intestatario</gridCol>
<gridCol id="5">Causale</gridCol>
<gridCol id="6">Stato</gridCol>
<gridCol id="7">Tot.doc.</gridCol>
<gridCol id="8">Data</gridCol>
<gridCol id="9">Peso</gridCol>
<gridCol id="10">Contrassegno</gridCol>
<gridCol id="11">Porto</gridCol>
<gridCol id="12">CAP</gridCol>
<gridCol id="13">Destinazione</gridCol>
<gridCol id="14">Indirizzo</gridCol>
<gridCol id="15">Citta'</gridCol>
<gridCol id="16">Provincia</gridCol>
<gridCol id="17">Colli</gridCol>
<gridCol id="18">Email</gridCol>
<gridCol id="19">Servizio</gridCol>
<gridCol id="20">Pagamento</gridCol>
<gridCol id="21">Fermo deposito</gridCol>
<gridCol id="22">Telefono destinatario</gridCol>
<gridCol id="23">Cellulare intestatario</gridCol>
</gridRow>
<gridRow id="1">
<gridCol id="1">any</gridCol>
<gridCol id="2">any</gridCol>
<gridCol id="3">any</gridCol>
<gridCol id="4">any</gridCol>
<gridCol id="5">any</gridCol>
<gridCol id="6">any</gridCol>
<gridCol id="7">any</gridCol>
<gridCol id="8">any</gridCol>
<gridCol id="9">any</gridCol>
<gridCol id="10">any</gridCol>
<gridCol id="11">any</gridCol>
<gridCol id="12">any</gridCol>
<gridCol id="13">any</gridCol>
<gridCol id="14">any</gridCol>
<gridCol id="15">any</gridCol>
<gridCol id="16">any</gridCol>
<gridCol id="18">any</gridCol>
<gridCol id="19">any</gridCol>
<gridCol id="20">any</gridCol>
<gridCol id="22">any</gridCol>
</gridRow>
</gridRows>
</readyGrid>

It is a dynamic file where there can be many gridRow, all inside the tag .

: where the id is 0, it says the header column, and from id="1" it list all the data.

I need to deserialize this .XML file in classes. Here is what I've got at the moment:

[XmlRoot(Namespace = "", ElementName = "readyGrid")]
public class Root
{
    [XmlElement("gridRows")]
    public List<GridRows> GridRows { get; set; }
}

public class GridRows
{
    [XmlElement("gridRow")]
    public List <GridRow> GridRow { get; set; }
}

public class GridRow
{
    [XmlAttribute("id")]
    public int Id { get; set; } 
    [XmlAttribute("gridCol")]
    public List<GridCol> GridCol { get; set; }
}

public class GridCol
{
    [XmlAttribute("id")]
    public int idColumn { get; set; }
    public string Content { get; set; }
}

And the code that should deserialize and put in classes:

XmlSerializer serializer = new XmlSerializer(typeof(Root));
var reader = new StreamReader(uploadFilePath);
List<GridRows> results = ((Root)serializer.Deserialize(reader)).GridRows;

However last code sample doesn't work, crashing on the first line. (System.InvalidOperationException, error in reflection .. )

I wonder if there's an easiest way to deserialize this XML file in classes or what I've to change in the code in order to make it work. Important thing is that I take the id="" and the content between tag.