using System;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

​

public class Program

{

    public static void Main()

    {

        var xml = @"<?xml version=""1.0"" encoding=""utf-8""?>

<Footballers>

    <product name=""iop"" />

    <product name=""Selvit E"" />

    <product name=""Selvit E"" />

    <product name=""Ventrifort A"" />

    <product name=""Generator"" />

    <product name=""TEst"" />        

    <product name=""test"" />

    <product name=""Test"" />

    <product name=""test"" />

    <product name=""ILT"" />

    <product name=""No Parking"" />

    <product name=""No Parking"" />

    <product name=""Livol Liquid"" />

    <product name=""G-promin"" />

</Footballers>";

        var doc = XDocument.Parse(xml);

        var elements = doc.Root.Elements().Distinct();

        var newDoc = new XDocument(new XElement("Footballers", elements));

        Console.WriteLine(newDoc.ToString());

    }

}