using System;
using System.Xml;

public class Test
{
	public static void Main()
	{
		        XmlDocument xd = new XmlDocument();
        xd.LoadXml(@"<xml xml:space=""preserve""><data> </data></xml>");
        XmlNode xn = xd.DocumentElement.SelectSingleNode("data");
        string data = xn.InnerText; // data == " "
        Console.WriteLine(data == " "); //True

	}
}