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Editing HTML file online from ASP.NET website

I have an ASP.NET website that is a panel for managing and sending e-mails. I want people to have an editor to changed what is in the template itself (which is writing in plain HTML.) in withing my site.
But, I don't want them to see the HTML. I just need them to edit the text and not touch the CSS/HTML to not destroy the look of it. Any tips or solutions that any one may know?

Use a free RichTextBox control in your project. You can find many open source or free controls out there.
Here's an example
http://www.freetextbox.com/
In this website you could find a list of controls that you could use.

You can use Ajax "HTMLEditior" or "HTMLEditiorExtender" for this
purpose
For what is HTMLEditor and how to use it follow this link
HTML Editor (AJAX Tool Kit)

Check ckeditor which has lot of editing features and your users can do almost everything. Also it supports inline editing.

Edit HTML files manipulating DOM in a jQuery style

I have a batch of HTML files which need some editions easy to perform with jQuery (mainly selecting some nodes and changing their attributes).
My approach to achive this, has been opening them one by one in Google Chrome, excecuting the jQuery code in the console, and then copying the resulting DOM back to my HTML editor.
Since what I'm currently doing takes a lot of time, and also due to the fact that every file needs the same edition (i.e., the same jQuery/JS code will work for every HTML file), I am considering to write a script/program to do this.
Anyway, I am not completely clear of which of the following (if any of them) approaches I should take to accomplish this task.
Write a JavaScript script with jQuery using some FileSystem/File manipulation library (which one?)
Write a Java or C# program using some jQuery-based library (like CsQuery)
Finding a plugin for some of my editors (Aptana, Notepad++, Eclipse, etc) or a completely different editor that supports jQuery-like commands for edition (just as notepad++ regex replacement support). This would be slow with big batches, but at least it would allow me to avoid the annoying copy/paste to/from Chrome.
Is one of this approaches the right way to accomplish what I need? (Is there a right way to do this?) Which should be more straight-forward?
I think that #2 would be easier for me since I have a lot more experience in Java and C# than in JavaScript, but I think that maybe that idea would be sort of using a sledgehammer to crack a nut.

You should consider using PhantomJs. It is a headless WebKit which can be executed from te commandline. It accepts a javascript or coffeescript file as a an argument, which can be used to e.g. do something with a web page. Here is an example:
var page = require('webpage').create();
page.open('http://m.bing.com', function(status) {
var title = page.evaluate(function(s) {
return document.querySelector(s).innerText;
}, 'title');
console.log(title);
phantom.exit();
});

I am not sure of the right way but it sounds like you are familiar with C# and would think writing a class library would be the least overhead for automation. Here are some potential solutions:
Scripting Library (e.g., C#.NET) - You can use a library like the one you mentioned or something like ScriptSharp if you want to use DOM manipulation. If the HTML has appropriate closing tags you can also use LINQ to easily navigate the HTML (or something like the HTML Agility Pack found on CodePlex). I would even recommend using Mustache with an HTML file template in C#.
JavaScript Library - If you wanted to stay in pure JavaScript you can use Node.js. There are file manipulation libraries you can use.
Headless Browsers - Haven't thought through being able to save the resulting HTML automatically but you can use something like jsTestDriver or Phantom.js
You can go with the plugins in editors as well, but I would stick with a Java, C#, python, etc. library that you can potentially call from existing application or schedule as a job/service.

c#-doc-viewer for VisualStudio

c# offers a nice way to document your c#-code. But I don´t find any nice viewer. I search something like the java-doc-viewer in eclipse. This viewer allows you to browse in the java-doc just by moving your mouse over eg. a class-name.
Does someone know a good extension for Visual Studio 2010 that contains such a viewer?
I have the "Productivity Power Tools"-Extension installed. But it hasn´t a real doc-viewer either.
Edit:
Here is a picture of what I search:
And this is the best I can find for VisualStudio:

You try using CR_Documentor, if you don't mind installing Code Rush (alone for that purpose; you only need the free "DXCore" actually, checkout the project's homepage for more information).
Note that this tool doesn't require a prior generation of the documentation using tools like Sandcastle. It works by simply placing your cursor in a API comment block, e.g. that of a method.
Obviously, this has some drawbacks, for example, links to other items (e.g. <see/> or <seealso> will be rendered as a link, but don't work as such).
This is what it looks like:
I was using it once, way back when it was still maintained by the original author Lutz Roeder, and it did it's job well. I have not been using it since.
Update: You could also use ReSharper, which provides a "Quick Documentation" feature.

There isn't any built-in tool in VS for viewing the documentation of your code. You have to generate the documentation pages from the XML doc, using external tools.
Free tools:
Sandcastle is the most well known, it has a lot of features, but it doesn't seem to be maintained any more and it's quite difficult to use (although Sandcastle Help File Builder makes it significantly easier, and is still maintained).
docu is simpler to use, but not specific to .NET
Monodoc (from the Mono project)
Commercial tools:
VSdocman
Document! X
Doc-O-Matic
ForgeDoc: this one is quite new and looks very promising: very lightweight, simple to use, fast, good-looking output... It's also much cheaper than the others above

You can use NDoc to build the API documentation and generate help files (typically HTML files)
http://sourceforge.net/projects/ndoc/

Adding a tool bar to a web page

I want to add a tool bar (just like the one above the text area where we type our questions in this forum , with bold,italic etc) to a web page.Is there an easier way of doing this?I am using ASP.Net c# and VS2008.
Thankx in advance.

Here is one of the well known ones.
http://ckeditor.com/

There are a bunch. The "most famous" is tinyMCE, but there is also CKEditor. If you need an highly customizable solution, you could also try Wysihat.

there is so many WYSWING editor (open source and commercial) In most of my cases CKEditor was the best option . it is opensource and fully customizable

Making my ASP.NET website compatible with Firefox?

I have an ASP.net website ( http://www.erate.co.za ) version 2.0.
When someone opens my website in Firefox everything looks different.
Why is that and how can I make it compatible?
Please help!
Etienne

The problems don't have anything to do with ASP.NET / C# Specifically.
They have to do with your understanding of web design / HTML / CSS and how you can make a cross-browser compatible UI.
I'd suggest you look at http://www.w3schools.com/ for some information on good web design practices.
Some obvious problems with the Source that you need to address are
No common css Stylesheets
Styles are applied inline on lots of elements
using long strings of " " to align text

The underlying server technology should not have any impact on your websites appearence as long as you are just producing HTML.
What you need to do is make sure that your HTML and CSS works as intended in all browsers. A good way to start is to make sure that you only output standards compliant code.

The issue at hand is that styles that you are using don't work in firefox such as cursor:hand; versus cursor:pointer; both work in IE but only pointer works in firefox. A quick recommendation would be to just run the resultant page through the w3c validator located at: http://validator.w3.org/

Per se, ASP.NET produce vanilla HTML/Javascript, so there's nothing wrong with the technology.
Focus on the html, try to be as close as possible to the w3c standards, it should help a lot.
Firebug, an incredible web dev extension for Firefox should also help you a lot in debugging your CSS.
It might be a painful task, especially if your site is old and big. Good luck!