[Urgent] XML validation using .Sch file extension (NMatrix.Schematron)

Hi all,
I am using third party dll Nmatrix.schematron dll for validating XML. following link provided the codes for only validating xml from xsd files.
http://msdn.microsoft.com/en-us/library/aa468554.aspx
But i need to validate xml file from .sch extension. pl help.