Initialize a xml class obtained from Edit, Paste Special, Paste XML as Classes

I have a little class generated from "Edit, Paste Special, Paste XML as Classes." like explains here. Generating Data Type Classes from XML

XML:

<?xml version="1.0"?>
<Items version="1.0">
  <Item InputFileName="G:\FileFile.txt">
    <Position X="500" Y="100" Z="150"/>
  </Item>
</Items>

Class:

namespace Produccion.ClassFile
{
/// <comentarios/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
public partial class Items
{

    private ItemsItem[] itemField;

    private decimal versionField;

    /// <comentarios/>
    [System.Xml.Serialization.XmlElementAttribute("Item")]
    public ItemsItem[] Item
    {
        get
        {
            return this.itemField;
        }
        set
        {
            this.itemField = value;
        }
    }

    /// <comentarios/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public decimal version
    {
        get
        {
            return this.versionField;
        }
        set
        {
            this.versionField = value;
        }
    }
}

/// <comentarios/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class ItemsItem
{

    private ItemsItemPosition positionField;

    private string inputFileNameField;

    /// <comentarios/>
    public ItemsItemPosition Position
    {
        get
        {
            return this.positionField;
        }
        set
        {
            this.positionField = value;
        }
    }

    /// <comentarios/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string InputFileName
    {
        get
        {
            return this.inputFileNameField;
        }
        set
        {
            this.inputFileNameField = value;
        }
    }
}

/// <comentarios/>
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class ItemsItemPosition
{

    private decimal xField;

    private decimal yField;

    private decimal zField;

    /// <comentarios/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public decimal X
    {
        get
        {
            return this.xField;
        }
        set
        {
            this.xField = value;
        }
    }

    /// <comentarios/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public decimal Y
    {
        get
        {
            return this.yField;
        }
        set
        {
            this.yField = value;
        }
    }

    /// <comentarios/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public decimal Z
    {
        get
        {
            return this.zField;
        }
        set
        {
            this.zField = value;
        }
    }
}

}

I don't know how I can initialize this class with data from file.