using System;

using System.Xml;

public class Program

{

    public static void Main()

    {

        var xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Invoice xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:cac=\"urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2\" xmlns:cbc=\"urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2\" xmlns:ccts=\"urn:un:unece:uncefact:documentation:2\" xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\" xmlns:ext=\"urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2\" xmlns:qdt=\"urn:oasis:names:specification:ubl:schema:xsd:QualifiedDatatypes-2\" xmlns:udt=\"urn:un:unece:uncefact:data:specification:UnqualifiedDataTypesSchemaModule:2\" xmlns=\"urn:oasis:names:specification:ubl:schema:xsd:Invoice-2\">  <ext:UBLExtensions>     <ext:UBLExtension> <ext:ExtensionContent><ds:Signature Id=\"SignSUNAT\"><SignedInfo xmlns=\"http://www.w3.org/2000/09/xmldsig#\"><CanonicalizationMethod Algorithm=\"http://www.w3.org/TR/2001/REC-xml-c14n-20010315\" /><SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\" /><Reference URI=\"\"><Transforms><Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\" /></Transforms><DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\" /><DigestValue>GZ72MM9mloR9hB2YzA4cxI5xWWY=</DigestValue></Reference></SignedInfo><SignatureValue xmlns=\"http://www.w3.org/2000/09/xmldsig#\">IYHnXkgzIkB4kZmd9LZbFnYoxx1mszAPzmOcW13vgjk6jjJT85+pbkvs0Tpmd9jT25DEnDgN7SQMoITDnhq1OX2cTHTQKPVfcMLzBTB46bMSg5yxhu1gFhPbQ3mnSAvLKbg74RFhZCjnpfiIwyRI14LbbLzb1EIO2LQKl7jc0Xo=</SignatureValue><KeyInfo xmlns=\"http://www.w3.org/2000/09/xmldsig#\"><X509Data><X509SubjectName>CN={A5993C3C-B459-4E3D-9621-7B427EE82646}</X509SubjectName><X509Certificate>MIICMTCCAZqgAwIBAgIQcaTD8ldZdJ1DssR9OIgGjzANBgkqhkiG9w0BAQsFADBXMVUwUwYDVQQDHkwAewBBADUAOQA5ADMAQwAzAEMALQBCADQANQA5AC0ANABFADMARAAtADkANgAyADEALQA3AEIANAAyADcARQBFADgAMgA2ADQANgB9MB4XDTE4MDMwNDE3NDE1N1oXDTE5MDMwNDIzNDE1N1owVzFVMFMGA1UEAx5MAHsAQQA1ADkAOQAzAEMAMwBDAC0AQgA0ADUAOQAtADQARQAzAEQALQA5ADYAMgAxAC0ANwBCADQAMgA3AEUARQA4ADIANgA0ADYAfTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAuDVhJvD2e2zG19di4amSy2eaqboEHk+qK7VvVJYIVPclxPWgcrT9QT/r8+xmAKga18if8gjGv2rzGfpjw4Q8VMzN14jzx1muPCaE+jSNeMknNzhOEF8RqkkXyQKOMgZcf1mXHQ0B3c95ibPz82pqSdLlWyq+GMMXmko6t56IFQUCAwEAATANBgkqhkiG9w0BAQsFAAOBgQBSbEy9waJhg/oyvWudgMabKWNgwSeg7pQkxsCuAmsta1VLypLHYEsN6jWQUII66VpClfZQEsIDhX8epTsMg8JejMqHkQSWgnyLk6rIVI9HVtA808gKMlQEu9A2wWaDfDT28yT7aZfzKYQFs1MM65WX1d/Ei5X1eBjxy1WqFnLbew==</X509Certificate></X509Data></KeyInfo></ds:Signature></ext:ExtensionContent></ext:UBLExtension> </ext:UBLExtensions>    <cbc:UBLVersionID>2.1</cbc:UBLVersionID>    <cbc:CustomizationID>2.0</cbc:CustomizationID>  <cbc:ID>FFF1-78990123</cbc:ID>  <cbc:IssueDate>2019-06-07</cbc:IssueDate>   <cbc:IssueTime>10:56:54.0000000-05:00</cbc:IssueTime>   <cbc:DueDate>2019-07-07</cbc:DueDate>   <cbc:InvoiceTypeCode listID=\"0101\" listAgencyName=\"PE:SUNAT\" listName=\"Tipo de Documento\" name=\"Tipo de Operacion\" listURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo51\">01</cbc:InvoiceTypeCode>   <cbc:DocumentCurrencyCode listID=\"ISO 4217 Alpha\" listAgencyName=\"United Nations Economic Commission for Europe\" listName=\"Currency\" listSchemeURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo51\">PEN</cbc:DocumentCurrencyCode>   <cac:Signature>     <cbc:ID>10096164144</cbc:ID>        <cbc:Note>Elaborado por Sistema de Emision Electronica NET SOLUTION DEVELOPER </cbc:Note>       <cac:SignatoryParty>            <cac:PartyIdentification>               <cbc:ID>10096164144</cbc:ID>            </cac:PartyIdentification>          <cac:PartyName>             <cbc:Name>MECATRONIC DHIGZA DIESEL S.A.C.</cbc:Name>            </cac:PartyName>        </cac:SignatoryParty>       <cac:DigitalSignatureAttachment>            <cac:ExternalReference>             <cbc:URI>SIGN</cbc:URI>         </cac:ExternalReference>        </cac:DigitalSignatureAttachment>   </cac:Signature>    <cac:AccountingSupplierParty>       <cac:Party>         <cac:PartyIdentification>               <cbc:ID schemeID=\"6\" schemeName=\"Documento de Identidad\" schemeAgencyName=\"PE:SUNAT\" schemeURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo06\">10096164144</cbc:ID>         </cac:PartyIdentification>          <cac:PartyName>             <cbc:Name>MECATRONIC DHIGZA DIESEL S.A.C.</cbc:Name>            </cac:PartyName>            <cac:PartyLegalEntity>              <cbc:RegistrationName>MECATRONIC DHIGZA DIESEL S.A.C.</cbc:RegistrationName>                <cac:RegistrationAddress>                   <cbc:AddressTypeCode>01</cbc:AddressTypeCode>                   <cbc:CitySubdivisionName>MZ. X LOT 7 PARQUE INDUSTRIAL EL ASESOR - ATE VITARTE</cbc:CitySubdivisionName>                    <cbc:CityName>LIMA</cbc:CityName>                   <cbc:CountrySubentity>LIMA</cbc:CountrySubentity>                   <cbc:CountrySubentityCode>01</cbc:CountrySubentityCode>                 <cbc:District>SMP</cbc:District>                    <cac:AddressLine>                       <cbc:Line>MZ. X LOT 7 PARQUE INDUSTRIAL EL ASESOR - ATE VITARTE</cbc:Line>                  </cac:AddressLine>                  <cac:Country>                       <cbc:IdentificationCode>PE</cbc:IdentificationCode>                 </cac:Country>              </cac:RegistrationAddress>          </cac:PartyLegalEntity>     </cac:Party>    </cac:AccountingSupplierParty>  <cac:AccountingCustomerParty>       <cac:Party>         <cac:PartyIdentification>               <cbc:ID schemeID=\"6\" schemeName=\"Documento de Identidad\" schemeAgencyName=\"PE:SUNAT\" schemeURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo06\">10096164144</cbc:ID>         </cac:PartyIdentification>          <cac:PartyLegalEntity>              <cbc:RegistrationName>MANUEL CHAVEZ VIERA</cbc:RegistrationName>            </cac:PartyLegalEntity>     </cac:Party>    </cac:AccountingCustomerParty>  <cac:TaxTotal>      <cbc:TaxAmount currencyID=\"PEN\">1386.75</cbc:TaxAmount>       <cac:TaxSubtotal>           <cbc:TaxableAmount currencyID=\"PEN\">7704.15</cbc:TaxableAmount>           <cbc:TaxAmount currencyID=\"PEN\">1386.75</cbc:TaxAmount>           <cac:TaxCategory>               <cbc:ID schemeID=\"UN/ECE 5153\" schemeName=\"Codigo de tributos\" schemeAgencyName=\"PE:SUNAT\">1000</cbc:ID>              <cac:TaxScheme>                 <cbc:ID schemeID=\"UN/ECE 5153\" schemeName=\"Codigo de tributos\" schemeAgencyName=\"PE:SUNAT\">1000</cbc:ID>                  <cbc:Name>IGV</cbc:Name>                    <cbc:TaxTypeCode>VAT</cbc:TaxTypeCode>              </cac:TaxScheme>            </cac:TaxCategory>      </cac:TaxSubtotal>  </cac:TaxTotal> <cac:LegalMonetaryTotal>        <cbc:LineExtensionAmount currencyID=\"PEN\">7704.15</cbc:LineExtensionAmount>       <cbc:TaxInclusiveAmount currencyID=\"PEN\">9090.90</cbc:TaxInclusiveAmount>     <cbc:AllowanceTotalAmount currencyID=\"PEN\">0.00</cbc:AllowanceTotalAmount>        <cbc:ChargeTotalAmount currencyID=\"PEN\">0.00</cbc:ChargeTotalAmount>      <cbc:PrepaidAmount currencyID=\"PEN\">0.00</cbc:PrepaidAmount>      <cbc:PayableAmount currencyID=\"PEN\">9090.90</cbc:PayableAmount>   </cac:LegalMonetaryTotal>   <cac:InvoiceLine>       <cbc:ID>1</cbc:ID>      <cbc:InvoicedQuantity unitCode=\"NIU\">2</cbc:InvoicedQuantity>     <cbc:LineExtensionAmount currencyID=\"PEN\">6060.60</cbc:LineExtensionAmount>       <cac:PricingReference>          <cac:AlternativeConditionPrice>             <cbc:PriceAmount currencyID=\"PEN\">3030.300</cbc:PriceAmount>              <cbc:PriceTypeCode listAgencyName=\"PE:SUNAT\" listName=\"SUNAT:Indicador de Tipo de Precio\" listURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo16\">01</cbc:PriceTypeCode>          </cac:AlternativeConditionPrice>        </cac:PricingReference>     <cac:TaxTotal>          <cbc:TaxAmount currencyID=\"PEN\">924.50</cbc:TaxAmount>            <cac:TaxSubtotal>               <cbc:TaxableAmount currencyID=\"PEN\">5136.10</cbc:TaxableAmount>               <cbc:TaxAmount currencyID=\"PEN\">924.50</cbc:TaxAmount>                <cac:TaxCategory>                   <cbc:Percent>18.00</cbc:Percent>                    <cbc:TaxExemptionReasonCode listAgencyName=\"PE:SUNAT\" listName=\"SUNAT: Codigo de Tipo de Afectación del IGV\" listURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo07\">10</cbc:TaxExemptionReasonCode>                  <cac:TaxScheme>                     <cbc:ID schemeID=\"UN/ECE 5153\" schemeName=\"Codigo de tributos\" schemeAgencyName=\"PE:SUNAT\">1000</cbc:ID>                      <cbc:Name>IGV</cbc:Name>                        <cbc:TaxTypeCode>VAT</cbc:TaxTypeCode>                  </cac:TaxScheme>                </cac:TaxCategory>          </cac:TaxSubtotal>      </cac:TaxTotal>     <cac:Item>          <cbc:Description>KIT EMPAQUES P/BOMBA TIPO VE C/RETEN 31MM</cbc:Description>            <cac:SellersItemIdentification>             <cbc:ID>SP-07599-3</cbc:ID>         </cac:SellersItemIdentification>        </cac:Item>     <cac:Price>         <cbc:PriceAmount currencyID=\"PEN\">2568.05</cbc:PriceAmount>       </cac:Price>    </cac:InvoiceLine>  <cac:InvoiceLine>       <cbc:ID>2</cbc:ID>      <cbc:InvoicedQuantity unitCode=\"NIU\">1</cbc:InvoicedQuantity>     <cbc:LineExtensionAmount currencyID=\"PEN\">3030.30</cbc:LineExtensionAmount>       <cac:PricingReference>          <cac:AlternativeConditionPrice>             <cbc:PriceAmount currencyID=\"PEN\">3030.300</cbc:PriceAmount>              <cbc:PriceTypeCode listAgencyName=\"PE:SUNAT\" listName=\"SUNAT:Indicador de Tipo de Precio\" listURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo16\">01</cbc:PriceTypeCode>          </cac:AlternativeConditionPrice>        </cac:PricingReference>     <cac:TaxTotal>          <cbc:TaxAmount currencyID=\"PEN\">462.25</cbc:TaxAmount>            <cac:TaxSubtotal>               <cbc:TaxableAmount currencyID=\"PEN\">2568.05</cbc:TaxableAmount>               <cbc:TaxAmount currencyID=\"PEN\">462.25</cbc:TaxAmount>                <cac:TaxCategory>                   <cbc:Percent>18.00</cbc:Percent>                    <cbc:TaxExemptionReasonCode listAgencyName=\"PE:SUNAT\" listName=\"SUNAT: Codigo de Tipo de Afectación del IGV\" listURI=\"urn:pe:gob:sunat:cpe:see:gem:catalogos:catalogo07\">10</cbc:TaxExemptionReasonCode>                  <cac:TaxScheme>                     <cbc:ID schemeID=\"UN/ECE 5153\" schemeName=\"Codigo de tributos\" schemeAgencyName=\"PE:SUNAT\">1000</cbc:ID>                      <cbc:Name>IGV</cbc:Name>                        <cbc:TaxTypeCode>VAT</cbc:TaxTypeCode>                  </cac:TaxScheme>                </cac:TaxCategory>          </cac:TaxSubtotal>      </cac:TaxTotal>     <cac:Item>          <cbc:Description>KIT DE EMPAQUES C/ORING DE TAPA GRUESO</cbc:Description>           <cac:SellersItemIdentification>             <cbc:ID>SP-07615</cbc:ID>           </cac:SellersItemIdentification>        </cac:Item>     <cac:Price>         <cbc:PriceAmount currencyID=\"PEN\">2568.05</cbc:PriceAmount>       </cac:Price>    </cac:InvoiceLine></Invoice>";

        var xmlDoc = new XmlDocument();

        xmlDoc.LoadXml(xml);

​

        XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);

        nsmgr.AddNamespace("inv", "urn:oasis:names:specification:ubl:schema:xsd:Invoice-2");

        nsmgr.AddNamespace("cbc", "urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2");

        nsmgr.AddNamespace("cac", "urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2");

        Console.WriteLine("XML-ID   :   " + xmlDoc.SelectSingleNode("inv:Invoice/cbc:ID",nsmgr).InnerText);

        Console.WriteLine("XML-Note :   " + xmlDoc.SelectSingleNode("inv:Invoice/cac:Signature/cbc:Note",nsmgr).InnerText);

        Console.WriteLine("XML-PartyID  :   " + xmlDoc.SelectSingleNode("inv:Invoice/cac:Signature/cac:SignatoryParty/cac:PartyIdentification/cbc:ID",nsmgr).InnerText);

        Console.WriteLine("XML-PartyName    :   " + xmlDoc.SelectSingleNode("inv:Invoice/cac:Signature/cac:SignatoryParty/cac:PartyName/cbc:Name",nsmgr).InnerText);

        Console.WriteLine("XML-IssueDate    :   " + xmlDoc.SelectSingleNode("inv:Invoice/cbc:IssueDate",nsmgr).InnerText);

        Console.WriteLine("XML-DueDate  :   " + xmlDoc.SelectSingleNode("inv:Invoice/cbc:DueDate",nsmgr).InnerText);

    }

}