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Add xsi:type to my XML document

I have a code to extract an XML document type using this web service method
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
XAttribute attribute = new XAttribute(xsi + "type", "xsd:string");
XElement node_user_id = new XElement("user_id", attribute, user.code);
XDocument doc = new XDocument(new XElement("ranzcp_user", new XAttribute(XNamespace.Xmlns + "ns1", "urn:logon"), node_user_id));
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(elem.ToString());
With the above code i was able to extract an xml document exactly like this :
<ranzcp_user xmlns:ns1="urn:logon">
<user_id xmlns:p3="http://www.w3.org/2001/XMLSchema-instance" p3:type="xsd:string">12345678</user_id>
</ranzcp_user>
But what i really need to have is this :
<ranzcp_user xmlns:ns1="urn:logon">
<user_id xsi:type="xsd:string">12345678</user_id>
</ranzcp_user>
Is there any way i could get the format i need for the xml, and second do the xsi:type="xsd:string" attribute was neccessary when the xml data was parsed?
TIA!

You could explicitly define the namespace prefix so you use the canonical xsi rather than p3:
var doc = new XDocument(
new XElement("ranzcp_user",
new XAttribute(XNamespace.Xmlns + "ns1", "urn:logon"),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XElement("user_id", 12345678,
new XAttribute(xsi + "type", "xsd:string")
)
)
);
See this fiddle. This gives you:
<ranzcp_user xmlns:ns1="urn:logon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<user_id xsi:type="xsd:string">12345678</user_id>
</ranzcp_user>
But, as has been said, removing the namespace prefix entirely would result in invalid XML - no conforming processor will let you create it or read it without errors.
Could it be that the 'required' XML has this prefix declared in one of the parent elements? If not, I'd suggest it's a mistake and you should investigate this before spending time trying to remove the attribute. I suspect you'd end up undoing all that effort when the consumer works out the XML is invalid.

XDocument Error Name cannot begin with the '<' character, hexadecimal value 0x3C

I am trying to create xml file using XDcoument, but I am getting following error
Name cannot begin with the '<' character, hexadecimal value 0x3C
here is my code
XDocument d = new XDocument(
new XElement("<S:Envelope xmlns:S='http://schemas.xmlsoap.org/soap/envelope/'>",
new XElement("<S:Header xmlns:wsse='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd'>",
new XElement("<ns13:ACASecurityHeader xmlns='urn:us:gov:treasury:irs:ext:aca:air:7.0' xmlns:ns10='urn:us:gov:treasury:irs:msg:acauibusinessheader' xmlns:ns11='http://www.w3.org/2000/09/xmldsig#' xmlns:ns12='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd' xmlns:ns13='urn:us:gov:treasury:irs:msg:acasecurityheader' xmlns:ns2='urn:us:gov:treasury:irs:common' xmlns:ns3='urn:us:gov:treasury:irs:msg:form1094-1095Btransmitterupstreammessage' xmlns:ns4='urn:us:gov:treasury:irs:msg:form1094-1095Ctransmitterupstreammessage' xmlns:ns5='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd' xmlns:ns6='urn:us:gov:treasury:irs:msg:form1094-1095BCtransmittermessage' xmlns:ns7='urn:us:gov:treasury:irs:msg:form1094-1095BCtransmitterreqmessage' xmlns:ns8='urn:us:gov:treasury:irs:msg:irsacabulkrequesttransmitter' xmlns:ns9='urn:us:gov:treasury:irs:msg:acabusinessheader'>"),
new XElement("Author", "Moreno, Jordao")
),
new XElement("Book",
new XElement("Title", "Midieval Tools and Implements"),
new XElement("Author", "Gazit, Inbar")
)
),
new XComment("This is another comment."));
Can someone please help me on this?
here is sample XML file which I want to generate using XDocument

There is a much simpler way to do this rather than crafting the XML document by hand via XDocument, though I have an explanation and example below if you want to do it that way.
First, the simple way - create the XML as a string, and pass that string to XDocument.Parse, like this:
string xmlString = #"<S:Envelope xmlns:S=""http://schemas.xmlsoap.org/soap/envelope/""><S:Header xmlns:wsse=""http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd""><ns13:ACASecurityHeader xmlns:ns10=""urn:us:gov:treasury:irs:msg:acauibusinessheader"" xmlns:ns11=""http://www.w3.org/2000/09/xmldsig#"" xmlns:ns12=""http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"" xmlns:ns13=""urn:us:gov:treasury:irs:msg:acasecurityheader"" xmlns:ns2=""urn:us:gov:treasury:irs:common"" xmlns:ns3=""urn:us:gov:treasury:irs:msg:form1094-1095Btransmitterupstreammessage"" xmlns:ns4=""urn:us:gov:treasury:irs:msg:form1094-1095Ctransmitterupstreammessage"" xmlns:ns5=""http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"" xmlns:ns6=""urn:us:gov:treasury:irs:msg:form1094-1095BCtransmittermessage"" xmlns:ns7=""urn:us:gov:treasury:irs:msg:form1094-1095BCtransmitterreqmessage"" xmlns:ns8=""urn:us:gov:treasury:irs:msg:irsacabulkrequesttransmitter"" xmlns:ns9=""urn:us:gov:treasury:irs:msg:acabusinessheader""><Author>Moreno, Jordao</Author><Book><Title>Midieval Tools and Implement</Title><Author>Gazit, Inbar</Author></Book></ns13:ACASecurityHeader><!--This is another comment--></S:Header></S:Envelope>";
XDocument xDoc2 = XDocument.Parse(xmlString);
xDoc2 will contain the XML you wish to send.
If you wish to do it the long way, then there are a couple of issues with your posted code.
First, you're not correctly handling the namespaces (the xmlns: attributes). Secondly, you're including the < and > in the call to XElement, and you don't need to do that - the method takes care of those two symbols.
What you need to do is to set up the namespaces, then add them to the appropriate elements as well as creating the attributes for them.
The sample code doesn't match the posted snippet, so I worked off your sample code to show you how to go about crafting the XML by hand.
XNamespace sNS = XNamespace.Get("http://schemas.xmlsoap.org/soap/envelope/");
XNamespace wsseNS = XNamespace.Get("http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
XNamespace xmlnsNS = XNamespace.Get("urn:us:gov:treasury:irs:ext:aca:air:7.0");
XNamespace ns10NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:acauibusinessheader");
XNamespace ns11NS = XNamespace.Get("http://www.w3.org/2000/09/xmldsig#");
XNamespace ns12NS = XNamespace.Get("http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
XNamespace ns13NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:acasecurityheader");
XNamespace ns2NS = XNamespace.Get("xmlns: ns2 = 'urn:us:gov:treasury:irs:common");
XNamespace ns3NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:form1094-1095Btransmitterupstreammessage");
XNamespace ns4NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:form1094-1095Ctransmitterupstreammessage");
XNamespace ns5NS = XNamespace.Get("http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd");
XNamespace ns6NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:form1094-1095BCtransmittermessage");
XNamespace ns7NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:form1094-1095BCtransmitterreqmessage");
XNamespace ns8NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:irsacabulkrequesttransmitter");
XNamespace ns9NS = XNamespace.Get("urn:us:gov:treasury:irs:msg:acabusinessheader");
XDocument xDoc = new XDocument(new XElement(sNS + "Envelope", new XAttribute(XNamespace.Xmlns + "S", sNS),
new XElement(sNS + "Header", new XAttribute(XNamespace.Xmlns + "wsse", wsseNS),
new XElement(ns13NS + "ACASecurityHeader", new XAttribute(XNamespace.Xmlns + "ns10", ns10NS),
new XAttribute(XNamespace.Xmlns + "ns11", ns11NS),
new XAttribute(XNamespace.Xmlns + "ns12", ns12NS),
new XAttribute(XNamespace.Xmlns + "ns13", ns13NS),
new XAttribute(XNamespace.Xmlns + "ns2", ns2NS),
new XAttribute(XNamespace.Xmlns + "ns3", ns3NS),
new XAttribute(XNamespace.Xmlns + "ns4", ns4NS),
new XAttribute(XNamespace.Xmlns + "ns5", ns5NS),
new XAttribute(XNamespace.Xmlns + "ns6", ns6NS),
new XAttribute(XNamespace.Xmlns + "ns7", ns7NS),
new XAttribute(XNamespace.Xmlns + "ns8", ns8NS),
new XAttribute(XNamespace.Xmlns + "ns9", ns9NS
new XAttribute("xmlns", xmlnsNS),
new XElement("Author", "Moreno, Jordao"),
new XElement("Book",
new XElement("Title", "Midieval Tools and Implement"),
new XElement("Author", "Gazit, Inbar"))
),
new XComment("This is another comment")
))
);
The first thing the above code does is sets up all the namespaces via XNamespace.
Next, the XML Document is constructed. The individual elements are created via XElement, with the various namespaces prefixed (i.e., new XElement(sNS + "Envelope",, and the other namespaces added via XAttribute.
Nesting can get tricky, so you have to be very careful doing it this way. The above code will produce the following XML:
<?xml version="1.0"?>
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Header xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<ns13:ACASecurityHeader xmlns="urn:us:gov:treasury:irs:ext:aca:air:7.0"
xmlns:ns9="urn:us:gov:treasury:irs:msg:acabusinessheader"
xmlns:ns8="urn:us:gov:treasury:irs:msg:irsacabulkrequesttransmitter"
xmlns:ns7="urn:us:gov:treasury:irs:msg:form1094-1095BCtransmitterreqmessage"
xmlns:ns6="urn:us:gov:treasury:irs:msg:form1094-1095BCtransmittermessage"
xmlns:ns5="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
xmlns:ns4="urn:us:gov:treasury:irs:msg:form1094-1095Ctransmitterupstreammessage"
xmlns:ns3="urn:us:gov:treasury:irs:msg:form1094-1095Btransmitterupstreammessage" xmlns:ns2="urn:us:gov:treasury:irs:common"
xmlns:ns13="urn:us:gov:treasury:irs:msg:acasecurityheader"
xmlns:ns12="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"
xmlns:ns11="http://www.w3.org/2000/09/xmldsig#"
xmlns:ns10="urn:us:gov:treasury:irs:msg:acauibusinessheader">
<Author>Moreno, Jordao</Author>
<Book>
<Title>Midieval Tools and Implement</Title>
<Author>Gazit, Inbar</Author>
</Book>
</ns13:ACASecurityHeader>
<!--This is another comment-->
</S:Header>
</S:Envelope>

What you're doing is a really hard way to do this. There is a much easier way.
You have the Xsd specifications from them, you can use the xsd command in the Visual Studio command line to generate C# objects that match the requirements automatically during serialization.
For the IRS ACA schemas, get all the XSD files into the same directory. Then in a sibling directory to the one you created, place the Common folder.
Then, in the command line navigate to the directory you created and put all the xsd files and run this command:
xsd /c IRS-EXT-ACA-AIR-7.0.xsd IRS-ACABulkRequestTransmitterMessage.xsd IRS-Form1094-1095CTransmitterUpstreamMessage.xsd IRS-CAC.xsd IRS-WSTimeStampElementMessage.xsd IRS-WSTimeStampElementMessage.xsd
You'll end up with a C# file that has almost 200 objects in it including all the enums and such necessary for generating data compliant with their specifications.

How to add Namespace and Declaration in XDocument

I am creating xml in C#, and want to add Namespace and Declaration . My xml as below:
XNamespace ns = "http://ab.com//abc";
XDocument myXML = new XDocument(
new XDeclaration("1.0","utf-8","yes"),
new XElement(ns + "Root",
new XElement("abc","1")))
This will add xmlns="" at both Root level and child element abc level as well.
<Root xmlns="http://ab.com/ab">
<abc xmlns=""></abc>
</Root>
But I want it in only Root level not in child level like below:
<Root xmlns="http://ab.com/ab">
<abc></abc>
</Root>
and how to add Declaration at Top, my code not showing Declaration after run.
Please help me to get the complete xml as
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<Root xmlns="http://ab.com/ab">
<abc></abc>
</Root>

You need to use the same namespace in your child elements:
XDocument myXML = new XDocument(
new XDeclaration("1.0","utf-8","yes"),
new XElement(ns + "Root",
new XElement(ns + "abc", "1")))
If you just use "abc" this will be converted to an XName with no Namespace. This then results in an xmlns="" attribute being added so the fully qualified element name for abc would be resolved as such.
By setting the name to ns + "abc" no xmlns attribute will be added when converted to string as the default namespace of http://ab.com/ab is inherited from Root.
If you wanted to simply 'inherit' the namespace then you wouldn't be able to do this in such a fluent way. You'd have create the XName using the namespace of the parent element, for example:
var root = new XElement(ns + "Root");
root.Add(new XElement(root.Name.Namespace + "abc", "1"));
Regarding the declaration, XDocument doesn't include this when calling ToString. It will if you use Save to write to a Stream, TextWriter, or if you supply an XmlWriter that doesn't have OmitXmlDeclaration = true in its XmlWriterSettings.
If you wanted to just get the string, this question has an answer with a nifty extension method using a StringWriter.

Use the namespace on all elements you create:
XDocument myXML = new XDocument(
new XDeclaration("1.0","utf-8","yes"),
new XElement(ns + "Root",
new XElement(ns + "abc","1")))

Write NameSpaces in XML

I need to generate an XML file using C# class (XmlDocument or XDocument) with the following root element:
<ns1:ConsultaSeqRps xmlns:ns1="http://localhost:8080/WsNFe2/lote"
xmlns:tipos="http://localhost:8080/WsNFe2/tp"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://localhost:8080/WsNFe2/lote http://localhost:8080/WsNFe2/xsd/ConsultaSeqRps.xsd">
I've tried various alternatives using setAttribute and XmlNamespaceManager but without success.

It's pretty straightforward, except maybe for the use of XAttribute to add a named namespace:
XNamespace ns1 = "http://localhost:8080/WsNFe2/lote";
XNamespace tipos = "http://localhost:8080/WsNFe2/tp";
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
var doc = new XElement(ns1 + "ConsultaSeqRps",
new XAttribute(XNamespace.Xmlns + "ns1", ns1),
new XAttribute(XNamespace.Xmlns + "tipos", tipos),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XAttribute(xsi + "schemaLocation",
"http://localhost:8080/WsNFe2/lote http://localhost:8080/WsNFe2/xsd/ConsultaSeqRps.xsd")
);

You can take the advantage of LINQ to XML, the following article will help you to Create namespace in c#
How to: Create a Document with Namespaces (C#) (LINQ to XML)
Hope that help.
Regards

ASP.net Creating an XLink node in and XDocument

I am trying to programmatically add a new XLink node to an XDocument but .Net seems to be creating them as atomized namespaces and names and I can't find any code to add XLink nodes to XML?
My code looks like this:
//read in the current XML content
XDocument content = XDocument.Parse(xmlContent);
//add a new node called large images
XElement newNode = new XElement("large_images", "");
newNode.SetAttributeValue("{xmlns}xlink", "http://www.w3.org/1999/xlink");
newNode.SetAttributeValue("{xlink}type", "simple");
newNode.SetAttributeValue("{xlink}href", "tcm:5-550");
newNode.SetAttributeValue("{xlink}title", "of1_454x340.jpg");
content.Add(newNode);
Unfortunately this newNode comes out like this:
<large_images p1:xlink="http://www.w3.org/1999/xlink" p2:type="simple" p2:href="tcm:5-550" p2:title="of1_454x340.jpg" xmlns:p2="xlink" xmlns:p1="xmlns"></large_images>
But I need the node to look like this in order for it to pass the XML validation:
<large_images xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="tcm:5-550" xlink:title="of1_454x340.jpg"></large_images>
Can anybody help? I don't want to go down the String.Replace() route as it seems that this must be possible another way?
Thanks
Ryan

I'd do that as:
XNamespace ns = "http://www.w3.org/1999/xlink";
XElement newNode = new XElement("large_images",
new XAttribute(XNamespace.Xmlns + "xlink", ns),
new XAttribute(ns + "type", "simple),
new XAttribute(ns + "href", "tcm:5-550"),
new XAttribute(ns + "title", "of1_454x340.jpg"));
This produces XML of:
<large_images xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple"
xlink:href="tcm:5-550" xlink:title="of1_454x340.jpg" />