Validate XML against a schema

  private static string ValidateXML(string xsd, string strXml,string emailfrom,string emailto)

    {

      string ret = "";

      string xsdfolder = ConfigurationManager.AppSettings["xsdfolder"];

         xsd = "cr_caseinfo.xsd";

      string schemaPath = xsdfolder + xsd;

      try

      {

        XmlDocument xml = new XmlDocument();

        xml.LoadXml(strXml);

        xml.Schemas.Add(null, schemaPath);

        xml.Validate(null);

      }

      catch (Exception ex)

      {

        Email.SendMail(emailfrom, emailto, "XML validation Error", ex.Source + "-" + ex.Message);

        // throw new WebFaultException(HttpStatusCode.BadRequest);

        ret = ex.Message;

      }

      return ret;

    }