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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var myList = new List<TestClass>{
                new TestClass{Prop1="val1", Prop2="val2"}  ,
                new TestClass{Prop1="val1", Prop2="val2"}  ,
                new TestClass{Prop1="val1", Prop2="val2"}  ,
            };
            
            Console.WriteLine(myList.ToXmlFile());
        }
    }
    
    public static class SerializationExtensions
    {
        public static string ToXmlFile<T>(this List<T> list)
        {
            XmlSerializer xmlSerializer = new XmlSerializer(typeof(List<T>)); 
     
            StringWriter stringWriter = new StringWriter(); 
            XmlTextWriter xmlWriter = new XmlTextWriter(stringWriter); 
     
            xmlWriter.Formatting = Formatting.Indented; 
            xmlSerializer.Serialize(xmlWriter, list); 
     
            return stringWriter.ToString();     
        }
    }
    
    public class TestClass
    {
        public string Prop1 {get;set;}
        public string Prop2 {get;set; }
    }
}

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Compilation time: 0.09 sec, absolute running time: 0.36 sec, cpu time: 0.3 sec, average memory usage: 23 Mb, average nr of threads: 6