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SelectNodes brings back to many results

Loading this XML works
<?xml version="1.0" encoding="utf-8" ?>
<export>
<document ID="uuuid_1">
<Property Name="PersonName" Value="bob"></Property>
<Property Name="FileName" Value="bob.tif">
<Reference Link="company\export\uuuid_1_423_bob.tif"/>
</Property>
<Property Name="FileName" Value="bob.txt">
<Reference Link="company\export\uuuid_1_123_bob.txt"/>
</Property>
<Property Name="FileName" Value="bob.tif">
<Reference Link="company\export\uuuid_1_123_bob.tif"/>
</Property>
</document>
<document ID="uuuid_2">
<Property Name="PersonName" Value="mary"></Property>
<Property Name="FileName" Value="mary.tif">
<Reference Link="company\export\uuuid_2_456_mary.tif"/>
</Property>
<Property Name="FileName" Value="mary.txt">
<Reference Link="company\export\uuuid_2_567_mary.txt"/>
</Property>
</document>
</export>
with that method
static void XmlLoader(string xml_path)
{
Console.WriteLine("Loading " + xml_path);
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(xml_path);
XmlNodeList nodes_document = xmldoc.SelectNodes("/export/document");
foreach (XmlNode nd in nodes_document)
{
string Id = nd.Attributes["ID"].Value.ToString();
string name = nd.SelectSingleNode("//Property[#Name='PersonName']/#Value").InnerText;
XmlNodeList files = nd.SelectNodes("//Property[#Name='FileName'][contains(#Value,'.tif')]/Reference/#Link");
Console.WriteLine(files.ToString());
}
}
The XmlNodeList inside the iteration of documents brings back a list of ALL tifs in the XML not only the ones from the nd Node.
How would I correctly use Xpath to select a list inside the nd element?

Just remove "//" from SelectNodes and SelectSingleNode. The double slash is parsing the complete xml
static void XmlLoader(string xml_path)
{
Console.WriteLine("Loading " + xml_path);
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(xml_path);
XmlNodeList nodes_document = xmldoc.SelectNodes("/export/document");
foreach (XmlNode nd in nodes_document)
{
string Id = nd.Attributes["ID"].Value.ToString();
string name = nd.SelectSingleNode("Property[#Name='PersonName']/#Value").InnerText;
XmlNodeList files = nd.SelectNodes("Property[#Name='FileName'][contains(#Value,'.tif')]/Reference/#Link");
Console.WriteLine(files.ToString());
}
}

Change XML element value in c#

My C# code:
XDocument doc = XDocument.Load(filename);
IEnumerable<XElement> collection =
doc.Elements("BCIRequest").Elements("Card").Elements("SelectedPIN");
My XML document:
<?xml version="1.0" encoding="utf-8"?>
<BCIRequest Version="2.0"
xmlns="urn:xxxxxx:bci:request">
<Header>
<SenderCode>XX99</SenderCode>
<SenderID>9999</SenderID>
<SequenceNumber>123</SequenceNumber>
<CardGroupCount>2</CardGroupCount>
<CardCount>4</CardCount>
<BlockCount>2</BlockCount>
</Header>
<!--card groups (must precede cards and blocks)-->
<CardGroup RequestID="1">
<CustomerNumber>XX01234567</CustomerNumber>
<CardGroupName Emboss="true">GROUP ONE</CardGroupName>
</CardGroup>
<CardGroup RequestID="2"
RequestRef="87416CB7-DAEF-483A-BD08-1A885531D958">
<CustomerNumber>XX12345678</CustomerNumber>
<CardGroupName Emboss="false">GROUP TWO</CardGroupName>
</CardGroup>
<Card RequestID="3">
<CustomerNumber>XX01234567</CustomerNumber>
<DriverCard>
<Driver Emboss="true">MARGE SIMPSON</Driver>
</DriverCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<GeneratedPIN/>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Card RequestID="4">
<CustomerNumber>XX12345678</CustomerNumber>
<VehicleCard>
<VRN Emboss="true">KYI 830</VRN>
</VehicleCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<SelectedPIN>0123</SelectedPIN>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Card RequestID="5">
<CustomerNumber>XX01234567</CustomerNumber>
<BearerCard>
<Bearer Emboss="true">OPEN XXXXXX</Bearer>
</BearerCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<FleetPIN/>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Block RequestID="6">
<CustomerNumber>XX01234567</CustomerNumber>
<PAN>7002999999999999991</PAN>
</Block>
<Card RequestID="7"
RequestRef="956EA6C5-7D7E-4622-94D0-38CAD9FCC8DF">
<CustomerNumber>XX01234567</CustomerNumber>
<DriverCard>
<Driver Emboss="true">HOMER SIMPSON</Driver>
<VRN Emboss="true">795 DVI</VRN>
</DriverCard>
<EmbossText>SPRINGFIELD POWER</EmbossText>
<CardTypeID>10</CardTypeID>
<TokenTypeID>20</TokenTypeID>
<PurchaseCategoryID>30</PurchaseCategoryID>
<ExpiryDate>2018-12</ExpiryDate>
<Reissue>true</Reissue>
<SelectedPIN>0123</SelectedPIN>
<OdoPrompt>true</OdoPrompt>
<CRNPrompt>true</CRNPrompt>
<!--address with optional fields specified-->
<CardDeliveryAddress OneTimeUse="false">
<ContactName>M xxxx</ContactName>
<ContactTitle>Mr</ContactTitle>
<CompanyName>Sxxxx</CompanyName>
<Line1>Sector 22-F</Line1>
<Line2>Springfield Power Plant</Line2>
<Line3>xxx Road</Line3>
<City>xxxx</City>
<Zipcode>xxxx</Zipcode>
<CountryCode>xxx</CountryCode>
</CardDeliveryAddress>
<!--address with only required fields-->
<PINDeliveryAddress OneTimeUse="true">
<Line1>xxxx</Line1>
<City>xxx</City>
<Zipcode>xxxx</Zipcode>
<CountryCode>xxxx</CountryCode>
</PINDeliveryAddress>
<Limits>
<Value Transaction="unlimited" Daily="200" Weekly="unlimited" Monthly="400"/>
<Volume Transaction="100" Daily="unlimited" Weekly="unlimited" Monthly="unlimited"/>
<Transactions Daily="unlimited" Weekly="unlimited" Monthly="unlimited"/>
<Day Monday="true" Tuesday="true" Wednesday="true" Thursday="true" Friday="true" Saturday="false" Sunday="false"/>
<Time Start="unlimited" End="17:00:00"/>
</Limits>
<Products>
<FuelProductRestrictionID>40</FuelProductRestrictionID>
<NonFuelProductRestrictionID>51</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>52</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>53</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>54</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>55</NonFuelProductRestrictionID>
</Products>
</Card>
<Block RequestID="8"
RequestRef="69A3E44D-DC10-4BEE-9249-1FC3C651BA0E">
<CustomerNumber>xxxxx</CustomerNumber>
<PAN>xxxxxx</PAN>
</Block>
</BCIRequest>
I need to update the element value in the above values. The old value is:
<SelectedPIN>0123</SelectedPIN>
And the new value should be:
<SelectedPIN EncryptedPIN="TKDS" FormNumber="000793906306">****</SelectedPIN>
Can anyone can help me on this?
If I selected the BCIRequest element, it's returning a null value. I've tried many solutions but unable to get one working on this XML file.

There many ways an Xml can be be modified, I prefer XDocument
XDocument doc = XDocument.Parse(input);
foreach (var element in doc.Descendants("SelectedPIN")) // filter if you want single element, in example I modifed for all elements.
{
element.Add(new XAttribute("EncryptedPIN", "TKDS"));
element.Add(new XAttribute("FormNumber", "000793906306"));
element.Value = "xxxxx"; //new value
}
and finally you can save the document using
doc.Save();
Take a look at this Demo

The root node (BCIRequest) contains a namespace so you need to include that into your query. Something like this should work:
XNamespace ns = "urn:xxxxxx:bci:request";
IEnumerable<XElement> collection = doc.Elements(ns + "BCIRequest").Elements(ns + "Card").Elements(ns + "SelectedPIN");

NullReferenceException unhandled by user code while changing XML document

I am getting the error : NullReferenceException was unhandled by user code , object reference not set to an instance of an object. While I want to change the element of an xml file. this is the code the error is generated on :
doc2.SelectSingleNode("/Document/CstmrCdtTrfInitn/GrpHdr/MsgId", nsmgr).InnerText = bank.Afkorting + "-0001";
This is the previous code :
XmlDocument doc2 = new XmlDocument();
doc2.Load(#"C:\Users\Kevin\Desktop\xsd\betalingen_sepa.xml");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc2.NameTable);
nsmgr.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
DagboekFinancieel bank = os.FindObject<DagboekFinancieel>(CriteriaOperator.Parse("[Omschrijving] = ?", opdracht.Bank));
doc2.SelectSingleNode("/Document/CstmrCdtTrfInitn/GrpHdr/MsgId", nsmgr).InnerText = bank.Afkorting + "-0001";
string naamFile = bank.Afkorting + "-0001";
doc2.Save(#"C:\" + naamFile + ".xml");
This is the original XML file I got :
<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:iso:std:iso:20022:tech:xsd:pain.001.001.03">
<CstmrCdtTrfInitn>
<GrpHdr>
<MsgId>#ref_xml#</MsgId>
<CreDtTm>#datum_tijd_xml#</CreDtTm>
<NbOfTxs>#aantal_transacties#</NbOfTxs>
<InitgPty>
<Nm>#afzender_naam#</Nm>
<Id>
<OrgId>
<Othr>
<Id>#afzender_btw_nr#</Id>
<Issr>KBO-BCE</Issr>
</Othr>
</OrgId>
</Id>
</InitgPty>
</GrpHdr>
<PmtInf>
<PmtInfId>#ref_payment_block#</PmtInfId>
<PmtMtd>TRF</PmtMtd>
<BtchBookg>true</BtchBookg>
<PmtTpInf>
<SvcLvl>
<Cd>SEPA</Cd>
</SvcLvl>
</PmtTpInf>
<ReqdExctnDt>#datum_uitvoering#</ReqdExctnDt>
<Dbtr>
<Nm>#afzender_naam#</Nm>
</Dbtr>
<DbtrAcct>
<Id>
<IBAN>#afzender_iban#</IBAN>
</Id>
</DbtrAcct>
<DbtrAgt>
<FinInstnId>
<BIC>#afzender_bic#</BIC>
</FinInstnId>
</DbtrAgt>
<ChrgBr>#kosten#</ChrgBr>
<CdtTrfTxInf>
<PmtId>
<EndToEndId>#ref_end_to_end#</EndToEndId>
</PmtId>
<Amt>
<InstdAmt Ccy="#munt#">#bedrag#</InstdAmt>
</Amt>
<CdtrAgt>
<FinInstnId>
<BIC>#leveran_bic#</BIC>
</FinInstnId>
</CdtrAgt>
<Cdtr>
<Nm>#leveran_naam#</Nm>
<PstlAdr>
<Ctry>#leveran_land#</Ctry>
<AdrLine>#leveran_straat#</AdrLine>
<AdrLine>#leveran_wpl#</AdrLine>
</PstlAdr>
</Cdtr>
<CdtrAcct>
<Id>
<IBAN>#leveran_iban#</IBAN>
</Id>
</CdtrAcct>
<RmtInf>
<Ustrd>#leveran_ref#</Ustrd>
<Strd>
<CdtrRefInf>
<Tp>
<CdOrPrtry>
<Cd>#gestruct_mededeling_soort1#</Cd>
</CdOrPrtry>
<Issr>#gestruct_mededeling_soort2#</Issr>
</Tp>
<Ref>#gestruct_mededeling#</Ref>
</CdtrRefInf>
</Strd>
</RmtInf>
</CdtTrfTxInf>
</PmtInf>
</CstmrCdtTrfInitn>
</Document>

Your xml namespace is not correct. Use it like
nsmgr.AddNamespace("ns", "urn:iso:std:iso:20022:tech:xsd:pain.001.001.03");
doc2.SelectSingleNode("/ns:Document/ns:CstmrCdtTrfInitn/ns:GrpHdr/ns:MsgId", nsmgr).InnerText = "some text";

insert element after selected node

Am trying to add a new element called entity after the last entity but it keeps adding it inside the selected entity. To understand better this is my xml sample.
<Root>
<Class Name="ECMInstruction" Style="Top">
<Entity Id="1" Name="DocumentInformation" />
<Entity Id="2" Name="CustomerInformation" />
<Property Id="1" Name="DocumentTitle">
</Property>
<Property Id="2" Name="DateCreated">
<Lists>
<ListName>ws_Users</ListName>
<ListName>dfdfdfd</ListName>
</Lists>
</Property>
<Property Id="3" Name="Deadline">
</Property>
</Class>
</Root>
This is how it looks like after is inserted. I've tried using insertAfter but it gives me error.
<Entity Id="1" Name="DocumentInformation">
<Entity Id="2" Name="sds" />
</Entity>
The code:
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load("sample.xml");
XmlNodeList cnode = xmldoc.DocumentElement.SelectNodes("//Class[#Name='" + CurrentClass + "']/Entity");
foreach (XmlNode c in cnode)
{
int value = 0;
String entitycount = cnode.Count.ToString();
int.TryParse(entitycount, out value);
value = value + 1;
XmlElement root = xmldoc.CreateElement("Entity");
root.SetAttribute("Id", value.ToString());
root.SetAttribute("Name", EntityNametxt.Text);
c.AppendChild(root);
xmldoc.Save("sample.xml");
}

"I've tried using insertAfter but it gives me error. "
As per documentation, InsertAfter() should be called on parent node of referenced XmlNode (the 2nd argument of the method), otherwise ArgumentException will be thrown :
//instead of this : c.AppendChild(root);
//..you could do as follow :
c.ParentNode.InsertAfter(root, c);

delete child node with specific value

Am trying to delete a list name containing the value "dfdfdfd" from an XPath
XmlNode names = LoadDocument(xml).DocumentElement.SelectSingleNode("//Class[#Name='" + getCurClass() + "']/Property[#Id='" + i + "']/Lists[contains(ListName,'ws_Users')]");
after I execute this statement:
names.RemoveChild(names.FirstChild);
but I nothing happens.
My XML :
<?xml version="1.0" encoding="utf-8"?>
<Root>
<Class Name="ECMInstruction" Style="Top">
<Entity Id="1" Name="DocumentInformation" />
<Property Id="1">
</Property>
<Property Id="2">
<Lists>
<ListName>ws_Users</ListName>
<ListName>dfdfdfd</ListName>
</Lists>
</Property>
</Class>
</Root>
Thanks for the help

You need to save the modified XmlDocument object back to file :
XmlDocument doc = LoadDocument(xml);
XmlNode names = doc.DocumentElement.SelectSingleNode("//Class[#Name='" + getCurClass() + "']/Property[#Id='" + i + "']/Lists[contains(ListName,'ws_Users')]");
names.RemoveChild(names.FirstChild);
//save `doc` back to file :
doc.Save("path_to_the_xml_file.xml");
or this way :
XmlNode names = LoadDocument(xml).DocumentElement.SelectSingleNode("//Class[#Name='" + getCurClass() + "']/Property[#Id='" + i + "']/Lists[contains(ListName,'ws_Users')]");
names.RemoveChild(names.FirstChild);
//save owner `XmlDocument` back to file :
names.OwnerDocument.Save("path_to_the_xml_file.xml");