public static string VerifyXmlChars(string content)
{
if (content == null)
{
throw new ArgumentNullException("content");
}
var idx = XmlChar.IndexOfInvalid(content, true);
if (idx < 0)
{
return(content);
}
throw new XmlException(string.Format("Invalid XML character was found in the content, at index {0}.", idx));
}
