Convert Datatable To XML in C#

public static string ConvertDatatableToXML(DataTable dt)

    {

        MemoryStream str = new MemoryStream();

        dt.WriteXml(str, true);

        str.Seek(0, SeekOrigin.Begin);

        StreamReader sr = new StreamReader(str);

        string xmlstr;

        xmlstr = sr.ReadToEnd();

        return (xmlstr);

    }