Modify code to take input from string

I have this code here:

static class Program
{
    static void Main()
    {
        // get the xml as a string; note that we could also use
        // Deserialize(Stream) to process a FileStream, but this
        // works fine
        string xml = File.ReadAllText(@"C:\Users\projects.xml");
        var ser = new XmlSerializer(typeof(xmlRoot));
        var root = (xmlRoot)ser.Deserialize(new StringReader(xml));
        foreach (var properties in root.Properties)
        {
            Console.WriteLine("LABEL_D: " + properties.LABEL_D); 
            Console.WriteLine("LABEL_E: " + properties.LABEL_E);
         }   
    }
}    

[XmlRoot("SHEET")]
public class xmlRoot
{
    private readonly List<Properties> properties = new List<Properties>();
    [XmlArray("PROPPAGE"), XmlArrayItem("CONTROL")]
    public List<Properties> Properties { get { return properties; } }
}
public class Properties
{  
    [XmlAttribute("LABEL_D")]
    public string LABEL_D { get; set; }

    [XmlAttribute("LABEL_E")]
    public string LABEL_E { get; set; }       
}

I have two xml files for which I want to retrieve the LABEL_D and LABEL_E attribute, so based on my code I want to be able to parse a string in the Main method and access the data.

I need to save the foreach loop in a list and at the end I need to return that list.