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Nesting XML Tags using Linq with Data From DB

I am trying to build an XML document using Linq, XElement and data from Database,
It's working kinda, but in my XML, I want to close the tag and start a new tag and get the results from the query to populate into for the Tag, it is complaining that my variable r in the tag is unresolved, how can I make this work, or is there a better way of building the XML. All the child elements should be under the parent , having two children and , which has their own set of children.
Here is the code below
public void GenerateXML(int id, string site, string state, string country, string bFn, string bLn, string sFn, string sLn)
{
var results = (from o in _db.Orders
where o.OrderId == id
select o).ToList();
var xmlDoc = new XElement("Order",
from r in results
select
new XElement("OrderHeader",
new XElement("SiteId", site),
new XElement("OrderId", r.OrderId),
new XElement("Time", r.OrderDate.Value),
new XElement("Subtotal", r.SubTotal),
new XElement("Shipping", ""),
new XElement("SalesTax", r.SalesTax),
new XElement("Total", r.Total),
new XElement("PaymentAmount", ""),
new XElement("PaymentMethod", ""),
new XElement("ArchiTypeAcctNum", "20001"),
new XElement("TaxExempt", r.TaxExempt),
new XElement("SpecialInstructions", r.SpecialInstructions),
new XElement("BillTo",
new XElement("BillEmail", r.BillToEmail),
new XElement("FirstName", bFn),
new XElement("LastName", bLn),
new XElement("CompanyName", r.BillCompany),
new XElement("Address1", r.BillToAddress),
new XElement("City", r.BillToCity),
new XElement("State", state),
new XElement("Country", country),
new XElement("Zip", r.BillToZip),
new XElement("Phone", r.BillToPhoneNumber)),
new XElement("ShipTo",
new XElement("FirstName", sFn),
new XElement("LastName", sLn),
new XElement("CompanyName", r.ShipCompany),
new XElement("Address1", r.ShipToAddress),
new XElement("City", r.ShipToCity),
new XElement("State", state),
new XElement("Country", country),
new XElement("Zip", r.ShipToZip),
new XElement("Phone", r.ShipToPhoneNumber))),
new XElement("Items",
from i in r.Items
select new XElement("Item",
new XElement("SKU", i.SkuNumber),
new XElement("PROD_Name", i.ProductName),
new XElement("Description", i.Description),
new XElement("Attributes", i.Attributes),
new XElement("Quantity", i.Quantity),
new XElement("UnitPrice", i.UnitPrice),
new XElement("InkColor", i.InkColor)))
);
xmlDoc.Save(Server.MapPath(#"~/Xml/Orders.xml"));
RedirectToAction("Save");
}

I wrote an extension for same purpose. I think much easier . you can just use as orders.EntityToXml();
public static class XmlExtensions
{
public static bool EntityToXml<T>(this T entity, string filePath)
{
if (string.IsNullOrEmpty(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
var dir = Path.GetDirectoryName(filePath);
if (string.IsNullOrEmpty(dir))
{
throw new ArgumentNullException(nameof(filePath));
}
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
var serializer= new System.Xml.Serialization.XmlSerializer(typeof(T));
using (var stream = new StreamWriter(filePath))
{
serializer.Serialize(stream , entity);
return true;
}
}
}

Add collection of items( xml elements) to XML doc

How to add the collection of items to XML Document ? Something I started trying, but it's wrong! I'll be grateful for the link on the Internet at a good tutorial too. Also, It is assumed that the iteration will be some elements.
Such code:
public static void Create_Interfaces()
{
XDocument Interfaces;
Interfaces = XDocument.Load("Interfaces.xml");
List<string> intf = new List<string>{"em0","em1","em2"};
foreach (var i in intf)
{
Interfaces = new XDocument(
new XElement("Interfaces",
new XElement("Interface",
new XElement("name", i),
new XElement("vlan-tagging", XElement.EmptySequence),
new XElement("unit",
new XElement("vlan-id", "10"),
new XElement("family", new XElement("inet", new XElement("address", new XElement("name", "10.10.1.23/24"))))))));
}
Interfaces.Save("Interfaces.xml");
}

Get your root element add new elements to it then save it:
var rootElement = Interfaces.Root;
foreach (var i in intf)
{
var element = new XElement("Interface",
new XElement("name", i),
new XElement("vlan-tagging", XElement.EmptySequence),
new XElement("unit",
new XElement("vlan-id", "10"),
new XElement("family",
new XElement("inet",
new XElement("address",
new XElement("name", "10.10.1.23/24"))))));
rootElement.Add(element);
}
rootElement.Save("Interfaces.xml");

Linq to XElement Preparation with some condtions

private XElement GetClinicalClientPrice(int invid)
{
using (MyDatabase db = new MyDatabase())
{
return new XElement("CLINICALCLIENTPRICE",
from ccp in db.TblClinicalClientPrice
where ccp.INVENTORY_ID == invid
select new XElement("Record",
new XElement("ITEM_ID",ccp.ITEM_ID),
new XElement("INVENTORY_ID", ccp.INVENTORY_ID),
new XElement("ITEM_DESCRIPTION", ccp.ITEM_DESCRIPTION),
new XElement("SUPPLIER_CAT", ccp.SUPPLIER_CAT),
new XElement("NDC_CODE", ccp.NDC_CODE),
new XElement("ITEM_NUMBER", ccp.ITEM_NUMBER),
new XElement("UOM", ccp.UOM),
new XElement("CONVERSION_FACTOR", ccp.CONVERSION_FACTOR),
new XElement("MANUFACTURER", ccp.MANUFACTURER),
new XElement("SESSION_ID", ccp.SESSION_ID),
new XElement("USERNAME", ccp.USERNAME),
new XElement("ENTRY_TIME", ccp.ENTRY_TIME),
new XElement("COST", ccp.COST),
new XElement("CLIENT_INPUT_ID", ccp.CLIENT_INPUT_ID),
new XElement("MHS_ITEM_ID", ccp.MHS_ITEM_ID),
new XElement("GUID", ccp.GUID),
new XElement("UNIQUE_ID", ccp.UNIQUE_ID),
new XElement("SUPPLIER_CAT_MODIFIED", ccp.SUPPLIER_CAT_MODIFIED),
new XElement("SIZE", ccp.SIZE),
new XElement("STRENGTH", ccp.STRENGTH)
));
}
}
I am getting (DateTime) Null value exception when I am inserting above resulted XElement into data base.
My Example is : stackoverflow.com/a/21163312/3121707

This operation would create an incorrectly structured document

I am new to XML and tried the following but I'm getting an exception. Can someone help me?
The exception is This operation would create an incorrectly structured document
My code:
string strPath = Server.MapPath("sample.xml");
XDocument doc;
if (!System.IO.File.Exists(strPath))
{
doc = new XDocument(
new XElement("Employees",
new XElement("Employee",
new XAttribute("id", 1),
new XElement("EmpName", "XYZ"))),
new XElement("Departments",
new XElement("Department",
new XAttribute("id", 1),
new XElement("DeptName", "CS"))));
doc.Save(strPath);
}

Xml document must have only one root element. But you are trying to add both Departments and Employees nodes at root level. Add some root node to fix this:
doc = new XDocument(
new XElement("RootName",
new XElement("Employees",
new XElement("Employee",
new XAttribute("id", 1),
new XElement("EmpName", "XYZ"))),
new XElement("Departments",
new XElement("Department",
new XAttribute("id", 1),
new XElement("DeptName", "CS"))))
);

You need to add root element.
doc = new XDocument(new XElement("Document"));
doc.Root.Add(
new XElement("Employees",
new XElement("Employee",
new XAttribute("id", 1),
new XElement("EmpName", "XYZ")),
new XElement("Departments",
new XElement("Department",
new XAttribute("id", 1),
new XElement("DeptName", "CS")))));

In my case I was trying to add more than one XElement to xDocument which throw this exception. Please see below for my correct code which solved my issue
string distributorInfo = string.Empty;
XDocument distributors = new XDocument();
XElement rootElement = new XElement("Distributors");
XElement distributor = null;
XAttribute id = null;
distributor = new XElement("Distributor");
id = new XAttribute("Id", "12345678");
distributor.Add(id);
rootElement.Add(distributor);
distributor = new XElement("Distributor");
id = new XAttribute("Id", "22222222");
distributor.Add(id);
rootElement.Add(distributor);
distributors.Add(rootElement);
distributorInfo = distributors.ToString();
Please see below for what I get in distributorInfo
<Distributors>
<Distributor Id="12345678" />
<Distributor Id="22222222" />
</Distributors>

How do I serialise a List<T> to XML using LINQ to XML?

I've this generic list
List<zil> listKD = new List<zil>
{
new zil{day="Mon",c="1",S1="08:00",S2="08:40",S3="08:47"},
new zil{day="Mon",c="2",S1="08:50",S2="09:30",S3="09:37"},
new zil{day="Mon",c="3",S1="09:40",S2="10:20",S3="10:27"},
new zil{day="Mon",c="4",S1="10:30",S2="11:10",S3="11:17"},
new zil{day="Tue",c="1",S1="08:00",S2="08:40",S3="08:47"},
new zil{day="Tue",c="2",S1="08:50",S2="09:30",S3="09:37"},
new zil{day="Wed",c="1",S1="08:00",S2="08:40",S3="08:47"},
new zil{day="Wed",c="2",S1="08:50",S2="09:30",S3="09:37"},
new zil{day="Thu",c="1",S1="08:00",S2="08:40",S3="08:47"},
new zil{day="Thu",c="2",S1="08:50",S2="09:30",S3="09:37"},
new zil{day="Thu",c="3",S1="09:40",S2="10:20",S3="10:27"},
new zil{day="Fri",c="1",S1="08:00",S2="08:40",S3="08:47"},
new zil{day="Fri",c="2",S1="08:50",S2="09:30",S3="09:37"},
new zil{day="Fri",c="3",S1="09:40",S2="10:20",S3="10:27"},
new zil{day="Fri",c="4",S1="10:30",S2="11:10",S3="11:17"},
};
and I want save,this list xml but I can't like this xml file
alt text http://aliaydin.com.tr/exXml.jpg
this code doesn't work for I want
XElement zXml = new XElement("Days",
from g in listKD
select new XElement("Day",
new XAttribute("id", g.Day),
new XElement("clock",
new XAttribute("id", g.c),
new XElement("s1", g.s1),
new XElement("s2", g.s2),
new XElement("s3", g.s3)
)));
ZXml.Save("abc.xml");
Thanks...

I think you haven't grouped by day; perhaps something like:
var el = new XElement("Days",
from z in listKD
group z by z.day into tmp
select new XElement("Day",
new XAttribute("id", tmp.Key),
from item in tmp
select new XElement("clock",
new XAttribute("id", item.c),
new XElement("s1", item.S1),
new XElement("s2", item.S2),
new XElement("s3", item.S3))
));
string s = el.ToString(); // or save etc
Update re comment; to reverse it, something like:
XElement parsed = XElement.Parse(s);
var newList = (from day in parsed.Elements("Day")
from clock in day.Elements("clock")
select new zil
{
day = (string)day.Attribute("id"),
c = (string)clock.Attribute("id"),
S1 = (string)clock.Element("S1"),
S2 = (string)clock.Element("S2"),
S3 = (string)clock.Element("S3")
}).ToList();
To filter to a specific day:
from day in parsed.Elements("Day")
where (string)day.Attribute("id") == "Mon"
from clock in day.Elements("clock")
...

[XmlArray("Zils"), XmlArrayItem("Zil", typeof(zil))]
public List<zil> listKD = new List<zil>();