using System;

using System.Xml.Linq;                  

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var input = "<div dir=\"ltr\"><div class=\"gmail_quote\"><strong><span style=\"font-family:"Arial","sans-serif"\">CA IQVIA EM Event Speaker info</span></strong></div></div>";

​

        try

        {

            var formatted = System.Xml.Linq.XElement.Parse(input).ToString();

        }

        catch

        {

            // Your input is not a valid xml fragment.

        }

    }

}