How to convert xml file to C# object?

I'm trying to convert this xml file to C# object but it doesn't work. I can't to get text between Group tags. The classes structure let me to get childs inside Group tag, but when Group tag has just one text inside, I can't select it.

I give the XML structure and my classes.

XML file:

<?xml version="1.0" encoding="utf-8"?>
<Main>
  <Group>
	  <NV>BasicPars</NV>
	  <Property>
		  <NV>Name</NV>
		  <Value>wzorzec</Value>
	  </Property>
	  <Property>
		  <NV>UseFixedSizes</NV>
		  <Value>False</Value>
	  </Property>
  </Group>
  <Group>EventPars</Group>
  <Group>Registers</Group>
</Main>

My classes:

[XmlRoot(ElementName="Property")]
public class Property { 

	[XmlElement(ElementName="NV")] 
	public string NV { get; set; } 

	[XmlElement(ElementName="Value")] 
	public string Value { get; set; } 
}

[XmlRoot(ElementName="Group")]
public class Group { 

	[XmlElement(ElementName="NV")] 
	public string NV { get; set; } 

	[XmlElement(ElementName="Property")] 
	public List<Property> Property { get; set; } 
}

[XmlRoot(ElementName="Main")]
public class Main { 

	[XmlElement(ElementName="Group")] 
	public List<Group> Group { get; set; } 
}

First, you only need XmlRoot on the root object (that is, Main). Remove it from the others.

In order to capture the text inside an element, use [XmlText].

The fixed classes are:

public class Property { 

    [XmlElement(ElementName="NV")] 
    public string NV { get; set; } 

    [XmlElement(ElementName="Value")] 
    public string Value { get; set; } 
}

public class Group { 

    [XmlElement(ElementName="NV")] 
    public string NV { get; set; } 

    [XmlElement(ElementName="Property")] 
    public List<Property> Property { get; set; }
	
	[XmlText]
    public string InnerText { get; set; }
}

[XmlRoot(ElementName="Main")]
public class Main { 

    [XmlElement(ElementName="Group")] 
    public List<Group> Group { get; set; } 
}

Which deserializes correctly.

public class Serializer
    {       
        public T Deserialize<T>(string input) where T : class
        {
            System.Xml.Serialization.XmlSerializer ser = new System.Xml.Serialization.XmlSerializer(typeof(T));

            using (StringReader sr = new StringReader(input))
            {
                return (T)ser.Deserialize(sr);
            }
        }

        public string Serialize<T>(T ObjectToSerialize)
        {
            XmlSerializer xmlSerializer = new XmlSerializer(ObjectToSerialize.GetType());

            using (StringWriter textWriter = new StringWriter())
            {
                xmlSerializer.Serialize(textWriter, ObjectToSerialize);
                return textWriter.ToString();
            }
        }
    }