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How to deserialize unknow XML in C#?

My question is : How to deserialize unknown XML to C# classes ? I know about "Paste special -> Paste XML as Classes" but i need something (code )which generate a C# classes object from XML. My program need add, remove and edit all nodes in tree XML.

You can do this by using XDocument, parsing the XML, outputting a C# CodeDom into memory, compiling it in memory. Not sure why you would want to do such a thing, but XML Parsing and CodeDom is the way to go to.

Using C# to display an XML file transformed by XSLT

I don't know if this is possible or if I am thinking about this in the wrong way, but this is what I want to do:
I have an XML file linked to an XSLT file and I want to use C# to get the output of the transformed XML file and Response.Write() that wherever I want on the page.
I have found questions on stackoverflow about saving the transformed output to a new file etc, but I don't want to save it to a file, I just want to display it with Response.Write() anywhere on my aspx page.
Is there any way to do this in C#?
Any help is appreciated.

Yes, save the transformed file to a MemoryStream (so in memory not the hard disk). You can then output that to a string using a filestrem reader.

Another way of doing it is by using the XML control, it has XML and XSLT properties.

You could save yourself the effort and simply serve up the XML to the browser. As long as the XML document references the URL of the corresponding XSLT document, the browser will render the page for you.

Use HttpResponse.OutputStream as output stream to save transformed file.

How to convert XML to HTML using c# dynamically

How to upload XML file and generate Html file without XSLT file using C#...

LINQ to XML is one option. See also: Generating HTML using LINQ

The question is a little open-ended, but you might consider just writing a program that:
Deserializes the XML.
Having read in the XML, format the text.
Output the text using the standard in/out libraries in C#.
I don't know if this is the most efficient solution -- but I think it would work.

How to validate an XML document?

My C#/.NET application reads XML files that are manually edited by the users. The allowed elements and tags are described in the application's documentation. I'm using LINQ to extract data from the XML file.
Before extracting data from the XML file, I'd like to validate it to see if it has the expected structure. If not, it would be nice to have information about what is wrong so that I can give some feeback to the user.
What's the simplest way to do this in C#?

You can validate xml files against XSD.
First you have to create Xml Schema Definition file. See example
use XML Schema Definition Tool to create XSD from XMLfile
Use this code to validate input XML using corresponding XSD
Hope this will help...
EDIT
This article explains all possible ways to validate xml, using C#
How To Validate an XML Document by Using DTD, XDR, or XSD in Visual C# .NET
IMO best option is to use XSD.

Validating Input Xml Data Files

Generating text file from database

I have a requirement to hand-code an text file from data residing in a SQL table. Just wondering if there are any best practices here. Should I write it as an XMLDocument first and transform using XSL or just use Streamwriter and skip transformation altogether? The generated text file will be in EDIFACT format, so layout is very specific.

The normal thing to do is just write the EDIFACT data directly.
Creating it as an XMLDocument and transforming it to EDIFACT might be useful if there's a library already available to do the transformation. I say this because there's a lot of language support for XML output.
I can't see how XSL will help you here, but I've never had to output EDIFACT data.

http://www.stylusstudio.com/edi/XML_to_EDIFACT.html
This URL has an example XSLT for translating XML to EDIFACT which might solve your problem.