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How to read xml file in c# with specific attribute

I have an xml file with attribute
xmlns="http://www.reservwire.com/namespace/WebServices/Xml">
When I remove this attribute, then I can read each tag. If I don't remove attribute I receive error message "Object refrence not set to instance of object"
My C# code:
XmlDocument xml = new XmlDocument();
xml.Load(Server.MapPath("~/HotelSearchCriteria/PrepareBooking.xml"));
string CommmitLevel = xml.DocumentElement
.SelectSingleNode("/BookingCreate/CommitLevel")
.InnerText;
My XML:
<BookingCreate xmlns="http://www.reservwire.com/namespace/WebServices/Xml">
<Authority>
<Org>danco</Org>
<User>xmltest</User>
<Password>xmltest</Password>
<Language>en</Language>
<Currency>EUR</Currency>
<TestDebug>false</TestDebug>
<Version>1.26</Version>
</Authority>
<QuoteId>17081233-3</QuoteId>
<HotelStayDetails>
<Room>
<Guests>
<Adult title="Mr" first="djkvb" last="jkj" />
<Adult title="Mr" first="jfs" last="kjdjs" />
</Guests>
</Room>
</HotelStayDetails>
<HotelSearchCriteria>
<AvailabilityStatus>allocation</AvailabilityStatus>
<DetailLevel>basic</DetailLevel>
</HotelSearchCriteria>
<CommitLevel>prepare</CommitLevel>
</BookingCreate>
What to do to read xml with xmlns attribute? It is necessary for me to have xmlns attribute.

You need to specify the namespace, by using a namespace manager. This should work
XmlDocument bookingXml = new XmlDocument();
bookingXml.Load("PrepareBooking.xml");
XmlNamespaceManager ns = new XmlNamespaceManager(bookingXml.NameTable);
ns.AddNamespace("booking", "http://www.reservwire.com/namespace/WebServices/Xml");
var commitLevel = bookingXml.SelectSingleNode("//booking:BookingCreate//booking:CommitLevel", ns).InnerText;

Using xml linq :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Program
{
const string FILENAME = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
XElement bookingCreate = doc.Descendants().Where(x => x.Name.LocalName == "BookingCreate").FirstOrDefault();
XNamespace ns = bookingCreate.GetDefaultNamespace();
var results = doc.Descendants(ns + "BookingCreate").Select(x => new {
org = (string)x.Descendants(ns + "Org").FirstOrDefault(),
user = (string)x.Descendants(ns + "User").FirstOrDefault(),
password = (string)x.Descendants(ns + "Password").FirstOrDefault(),
language = (string)x.Descendants(ns + "Language").FirstOrDefault(),
currency = (string)x.Descendants(ns + "Currency").FirstOrDefault(),
testDebug = (Boolean)x.Descendants(ns + "TestDebug").FirstOrDefault(),
version = (string)x.Descendants(ns + "Version").FirstOrDefault(),
quoteId = (string)x.Element(ns + "QuoteId"),
guests = x.Descendants(ns + "Adult").Select(y => new {
title = (string)y.Attribute("title"),
first = (string)y.Attribute("first"),
last = (string)y.Attribute("last")
}).ToList(),
availability = (string)x.Descendants(ns + "AvailabilityStatus").FirstOrDefault(),
detailLevel = (string)x.Descendants(ns + "DetailLevel").FirstOrDefault()
}).FirstOrDefault();
}
}
}

c# how to create XML file with XSD schemas

<?xml version="1.0" encoding="UTF-8"?>
<!--Sample XML file generated by XMLSpy v2013 (http://www.altova.com)-->
<ftc:FATCA_OECD version="2.0" xsi:schemaLocation="urn:oecd:ties:fatca:v2 FatcaXML_v2.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ftc="urn:oecd:ties:fatca:v2" xmlns:sfa="urn:oecd:ties:stffatcatypes:v2">
<ftc:MessageSpec>
<sfa:SendingCompanyIN>S519K4.99999.SL.392</sfa:SendingCompanyIN>
<sfa:TransmittingCountry>JP</sfa:TransmittingCountry>
<sfa:ReceivingCountry>US</sfa:ReceivingCountry>
<sfa:MessageType>FATCA</sfa:MessageType>
<sfa:MessageRefId>DBA6455E-8454-47D9-914B-FEE48E4EF3AA</sfa:MessageRefId>
<sfa:ReportingPeriod>2016-12-31</sfa:ReportingPeriod>
<sfa:Timestamp>2017-01-17T09:30:47Z</sfa:Timestamp>
</ftc:MessageSpec>
</ftc:FATCA_OECD>
my code:
XmlDocument doc = new XmlDocument();
XmlDeclaration xmlDeclaration = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
XmlElement root = doc.DocumentElement;
doc.InsertBefore(xmlDeclaration, root);
XmlElement element1 = doc.CreateElement("<ftc:FATCA_OECD version=\"2.0\" xsi:schemaLocation=\"urn:oecd:ties:fatca:v2 FatcaXML_v2.0.xsd\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:ftc=\"urn:oecd:ties:fatca:v2\" xmlns:sfa=\"urn:oecd:ties:stffatcatypes:v2\">");
doc.AppendChild(element1);
XmlElement element2 = doc.CreateElement("ftc:MessageSpec");
element1.AppendChild(element2);
XmlElement element3 = doc.CreateElement("sfa:SendingCompanyIN");
XmlText text1 = doc.CreateTextNode(txt_SendingCompanyIN.Text);
element3.AppendChild(text1);
element2.AppendChild(element3);
XmlElement element4 = doc.CreateElement("sfa:TransmittingCountry");
XmlText text2 = doc.CreateTextNode(txt_TransmittingCountry.Text);
element4.AppendChild(text2);
element2.AppendChild(element4);
XmlElement element5 = doc.CreateElement("sfa:ReceivingCountry");
XmlText text3 = doc.CreateTextNode(txt_ResCountryCode.Text);
element4.AppendChild(text3);
element2.AppendChild(element4);
I need to create the following XML and I'm trying to do this using XDocument. but fail cannot create xml file?
how can i create a xsd schema for this xml file?

Try following :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication48
{
class Program
{
static void Main(string[] args)
{
//<?xml version="1.0" encoding="UTF-8"?>
//<!--Sample XML file generated by XMLSpy v2013 (http://www.altova.com)-->
//<ftc:FATCA_OECD version="2.0" xsi:schemaLocation="urn:oecd:ties:fatca:v2 FatcaXML_v2.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ftc="urn:oecd:ties:fatca:v2" xmlns:sfa="urn:oecd:ties:stffatcatypes:v2">
// <ftc:MessageSpec>
// <sfa:SendingCompanyIN>S519K4.99999.SL.392</sfa:SendingCompanyIN>
// <sfa:TransmittingCountry>JP</sfa:TransmittingCountry>
// <sfa:ReceivingCountry>US</sfa:ReceivingCountry>
// <sfa:MessageType>FATCA</sfa:MessageType>
// <sfa:MessageRefId>DBA6455E-8454-47D9-914B-FEE48E4EF3AA</sfa:MessageRefId>
// <sfa:ReportingPeriod>2016-12-31</sfa:ReportingPeriod>
// <sfa:Timestamp>2017-01-17T09:30:47Z</sfa:Timestamp>
// </ftc:MessageSpec>
//</ftc:FATCA_OECD>
string header =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<ftc:FATCA_OECD" +
" version=\"2.0\" xsi:schemaLocation=\"urn:oecd:ties:fatca:v2 FatcaXML_v2.0.xsd\"" +
" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"" +
" xmlns:ftc=\"urn:oecd:ties:fatca:v2\"" +
" xmlns:sfa=\"urn:oecd:ties:stffatcatypes:v2\">" +
"</ftc:FATCA_OECD>";
XDocument doc = XDocument.Parse(header);
XElement FATCA_OECD = (XElement)doc.FirstNode;
XNamespace ftcNS = FATCA_OECD.GetNamespaceOfPrefix("ftc");
XNamespace sfaNS = FATCA_OECD.GetNamespaceOfPrefix("sfa");
XElement MessageSpec = new XElement(ftcNS + "MessageSpec", new object[] {
new XElement(sfaNS + "SendingCompanyIN", "S519K4.99999.SL.392"),
new XElement(sfaNS + "TransmittingCountry", "JP"),
new XElement(sfaNS + "ReceivingCountry", "US"),
new XElement(sfaNS + "MessageType", "FATCA"),
new XElement(sfaNS + "MessageRefId", "DBA6455E-8454-47D9-914B-FEE48E4EF3AA"),
new XElement(sfaNS + "ReportingPeriod", "2016-12-31"),
new XElement(sfaNS + "Timestamp", "2017-01-17T09:30:47Z"),
});
FATCA_OECD.Add(MessageSpec);
}
}
}

C# with XDocument and xsi:schemaLocation

I want to create the following XML.
<?xml version="1.0" encoding="utf-8"?>
<MyNode xsi:schemaLocation="https://MyScheme.com/v1-0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="https://MyScheme.com/v1-0 Sscheme.xsd">
<MyInfo>
<MyNumber>string1</MyNumber>
<MyName>string2</MyName>
<MyAddress>string3</MyAddress>
</MyInfo>
<MyInfo2>
<FirstName>string4</FirstName>
</MyInfo2>
</MyNode>
I'm using this code.
XNamespace xmlns = "https://MyScheme.com/v1-0 Sscheme.xsd";
XNamespace xsi = XNamespace.Get("http://www.w3.org/2001/XMLSchema-instance");
XNamespace schemaLocation = XNamespace.Get("https://MyScheme.com/v1-0");
XDocument xmlDocument = new XDocument(
new XElement(xmlns + "MyNode",
new XAttribute(xsi + "schemaLocation", schemaLocation),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XElement("MyInfo",
new XElement("MyNumber", "string1"),
new XElement("MyName", "string2"),
new XElement("MyAddress", "string3")
),
new XElement("MyInfo2",
new XElement("FirstName", "string4")
)
)
);
xmlDocument.Save("C:\\MyXml.xml");
However, I'm getting xmlns="" inside tags MyInfo and MyInfo2.
Can somebody help me to create the correct XML?

You need to use xmlns XNamespace for all elements, because that is default namespace and it is declared at root level element. Note that descendant elements inherit ancestor default namespace implicitly, unless otherwise specified :
XDocument xmlDocument = new XDocument(
new XElement(xmlns + "MyNode",
new XAttribute(xsi + "schemaLocation", schemaLocation),
new XAttribute(XNamespace.Xmlns + "xsi", xsi),
new XElement(xmlns+"MyInfo",
new XElement(xmlns+"MyNumber", "string1"),
new XElement(xmlns+"MyName", "string2"),
new XElement(xmlns+"MyAddress", "string3")
),
new XElement(xmlns+"MyInfo2",
new XElement(xmlns+"FirstName", "string4")
)
)
);
Dotnetfiddle Demo

How can I write xml with a namespace and prefix with XElement?

This may be a beginner xml question, but how can I generate an xml document that looks like the following?
<root xmlns:ci="http://somewhere.com" xmlns:ca="http://somewhereelse.com">
<ci:field1>test</ci:field1>
<ca:field2>another test</ca:field2>
</root>
If I can get this to be written, I can get the rest of my problem to work.
Ideally, I'd like to use LINQ to XML (XElement, XNamespace, etc.) with c#, but if this can be accomplished easier/better with XmlDocuments and XmlElements, I'd go with that.
Thanks!!!

Here is a small example that creates the output you want:
using System;
using System.Xml.Linq;
class Program
{
static void Main()
{
XNamespace ci = "http://somewhere.com";
XNamespace ca = "http://somewhereelse.com";
XElement element = new XElement("root",
new XAttribute(XNamespace.Xmlns + "ci", ci),
new XAttribute(XNamespace.Xmlns + "ca", ca),
new XElement(ci + "field1", "test"),
new XElement(ca + "field2", "another test"));
}
}

Try this code:
string prefix = element.GetPrefixOfNamespace(element.Name.NamespaceName);
string name = String.Format(prefix == null ? "{1}" : "{0}:{1}", prefix, element.Name.LocalName);`

I hope you will get some useful information from this thread - XElement default namespace on attributes provides unexpected behaviour
EDIT:
Another FAQ at - http://social.msdn.microsoft.com/Forums/en-US/xmlandnetfx/thread/c0648840-e389-49be-a3d2-4d5db17b8ddd

XNamespace ci = "http://somewhere.com";
XNamespace ca = "http://somewhereelse.com";
XElement root = new XElement(aw + "root",
new XAttribute(XNamespace.Xmlns + "ci", "http://somewhere.com"),
new XAttribute(XNamespace.Xmlns + "ca", "http://somewhereelse.com"),
new XElement(ci + "field1", "test"),
new XElement(ca + "field2", "another test")
);
Console.WriteLine(root);
This should output
<root xmlns:ci="http://somewhere.com" xmlns:ca="http://somewhereelse.com">
<ci:field1>test</ci:field1>
<ca:field2>another test</ca:field2>
</root>

For XmlDocument it's similar:
XmlAttribute attribute1 = sessionXml.CreateAttribute("s", "Attribute1", namespaceURI);
XmlAttribute attribute2 = sessionXml.CreateAttribute("s", "Attribute2", namespaceURI);
XmlAttribute attribute3 = sessionXml.CreateAttribute("s", "Attribute3", namespaceURI);
XmlAttribute attribute4 = sessionXml.CreateAttribute("s", "Attribute4", namespaceURI);

Setting XML namespaces with the System.Xml.Linq API

I'm having trouble generating XML along the lines of this:
<Root xmlns:brk="http://somewhere">
<child1>
<brk:node1>123456</brk:node1>
<brk:node2>500000000</brk:node2>
</child1>
</Root>
This code get me most of the way, but I can't get the 'brk' namespace in front of the nodes;
var rootNode = new XElement("Root");
rootNode.Add(new XAttribute(XNamespace.Xmlns + "brk", "http://somewhere"));
var childNode = new XElement("child1");
childNode.Add(new XElement("node1",123456));
rootNode.Add(childNode);
I've tried this:
XNamespace brk = "http://somewhere";
childNode.Add(new XElement(brk+"node1",123456));
and this
XNamespace brk = "http://somewhere";
childNode.Add(new XElement("brk:node1",123456));
but both cause exceptions.

You are almost there, but you made one simple error in your first code example. I believe this is what you require:
XNamespace brk = "http://somewhere.com";
XElement root = new XElement("Root",
new XAttribute(XNamespace.Xmlns + "brk", "http://somewhere.com"));
XElement childNode = new XElement("child1");
childNode.Add(new XElement(brk + "node1",123456));
root.Add(childNode);
The main difference here is where I add node1 to childNode as follows:
childNode.Add(new XElement(brk + "node1",123456));
This code, given an XmlWriter and XDocument gives me the output:
<?xml version="1.0" encoding="utf-8"?>
<Root xmlns:brk="http://somewhere.com">
<child1>
<brk:node1>123456</brk:node1>
</child1>
</Root>
See MSDN for details of using XNamespace.

I believe the problem is that the root element needs to have the namespace as well:
XElement root = new XElement("Root",
new XAttribute(XNamespace.Xmlns + "brk", "http://somewhere.com"));
needs to be:
XElement root = new XElement(brk + "Root",
new XAttribute(XNamespace.Xmlns + "brk", "http://somewhere.com"));

This is solotuion and working fine.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;
using System.Xml.Serialization;
namespace CreateSampleXML
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
XNamespace xm = "http://somewhere.com";
XElement rt= new XElement("Root", new XAttribute(XNamespace.Xmlns + "brk", "http://somewhere.com"));
XElement cNode = new XElement("child1");
cNode.Add(new XElement(xm + "node1", 123456));
cNode.Add(new XElement(xm + "node2", 500000000));
rt.Add(cNode);
XDocument doc2 = new XDocument(rt);
doc2.Save(#"C:\sample3.xml");
}
}
}