How to pass list in xelement while creating XML document

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C#

Hi, i am creating and XMLDocument and my code look like that:-

XNamespace SoapNs = "http://schemas.xmlsoap.org/soap/envelope/";
XNamespace TempNs = "http://tempuri.org/";
XNamespace ArrayNs= "http://schemas.microsoft.com/2003/10/Serialization/Arrays";

XDocument doc = new XDocument(
                     new XDeclaration("1.0", "utf-8", null),
                     new XElement(SoapNs + "Envelope",
                     new XAttribute(XNamespace.Xmlns + "soapenv", SoapNs),
                     new XAttribute(XNamespace.Xmlns + "tem", TempNs),
                     new XAttribute(XNamespace.Xmlns + "arr", ArrayNs),
                     new XElement(SoapNs + "Header"),
                     new XElement(SoapNs + "Body",
                     new XElement(TempNs + "MyData",
                     new XElement(TempNs + "Code", "Cirrus " + Guid.NewGuid().ToString()),

                     new XElement(TempNs + "Username", "testusername"),
                     new XElement(TempNs + "listoffiles",  new XElement(ArrayNs + "string",lst )),

                     new XElement(TempNs + "createdby", "System")))
                  )
             );

here i need to pass List of values in "listoffiles" node. and my xml will create for this value look like :-

<listoffiles>
  <arr:string>testfile1.csv</arr:string>
 <arr:string>testfile2.csv</arr:string>
</listoffiles>

What I have tried:

here is my code which i tried:-

List<string> lst = new List<string>();
      lst.Add("testfile1.csv");
      lst.Add("testfile2.csv");

i passes this list in my XMLDOcument code but it append the list values in a single row like this:-

<listoffiles>
  <arr:string>testfile1.csvtestfile2.csv</arr:string>
</listoffiles>

can any one suggest me the solution