using System;

using System.Text;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        string test = "<CompliSearchSyncIdentifierXmlList><Identifiers><Identifier><Id>12345</Id></Identifier><Identifier><Id>67890</Id></Identifier></Identifiers></CompliSearchSyncIdentifierXmlList>";

        // convert string to stream

        byte[] byteArray = Encoding.ASCII.GetBytes( test );

        MemoryStream messagePayload = new MemoryStream( byteArray );

        string xmlString = string.Empty;

        using (StreamReader reader = new StreamReader(messagePayload, Encoding.UTF8)) {

            xmlString = reader.ReadToEnd();

        }

        Console.WriteLine(xmlString);

    }

}