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monitoring most common web browsers c#/vc++/c

i'm trying to do a download manager just for learning cos i'm new in windows programming,
could someone tell me how to monitor most common web browsers,
i'd like to implement something like:
http://www.iwisoft.com/videodownloader/video-downloader-features.php
everytime you visit a web page in common browsers detects all video files in the web page and allow you to download or not the file, any idea how to do that without building an app for every browser, which is the best language to do it c#/vc++/managed/unmanaged,
i'm learning and using a mix of all to do other parts like download files, add rules to firewall or modify the registry
thanks a lot

I don't really know a neat way of doing this, but you could try the following :
Enumerate the name of the current window using GetForegroundWindow.
Check if the name you get using GetWindowText matches the usual name of the browser.
If it is a browser, moniter the clipboard and check for hyperlinks
then do your download stuff.
I program in C++ and assembly, but I wouldn't be able to advice you on the programming language since I don't have any experience with C#. But since you are new, I would suggest starting out with basic stuff. As pointed out in your comment, this is not something that can be achieved easily.

FLinq on a Page

I normally work on C# but could understand other languages.
I'm pretty much trying to retrieve the list of people that LIKE my Facebook Page
where I am an Admin.
So what is the easiest way to do so ?
Remember I tend to use C# as the programming language...

In short, read the answer from Jonathan Dean at How to list facebook users who like a page or interest
But learning the facebook API is a good way to expand your horizons.
Register with facebook to become a developer.
Download and get some of the sample apps running from
http://facebooksdk.codeplex.com/documentation
Get used to the new graph API using facebook's tool.
https://developers.facebook.com/tools/explorer
Study up on FQL and how to run it thru the new graph API.

Allowing the user to comment/reply in a webpage?

i am creating an ASP.NET C# web application and I am looking for the easiest way to do a comments system.
I'll explain.
I have a page containing Items (list items containing texts)
I want the users to be able to click on one, and then he is allowed to reply or comment to it. and he can see what others have replied too.
Is there a library or API that can do that? and if not can you give me tips on how to do it?

Have a look at systems like DISQUS or Livefyre. The benefit of using such services (besides avoiding development) is social integration.

How to integrate C# Code with Ofbiz 9?

I have one C# Application written using .net framework4.0.It is working good.Now i want to integrate this C# code with my OFBIZ 9 version.Is this possible to integrate C# with OFBIZ. In my C# Application, I have forms for user interaction and also business logic for accessing word document(OOXML).for example, Getting particular paragraph in the Word Document depending upon user login. I don't know is this possible to integrate C# with OFBIZ?.
Please anybody having Idea or experience share with me...
I am eagerly waiting for your reply...
Thanks & Regards,
P.SARAVANAN.

Please take a look at this PDF: http://www.opensourcestrategies.com/ofbiz/OFBIZ_SOAP_RMI_Tutorial.pdf
To summarize: All the Ofbiz services can be exported to be available to be called from outside Ofbiz using RMI OR SOAP. Attached PDF has some nice examples on this. This way you can call any Ofbiz service from C# or any other platform remotely.

How can I read data from a textbox with no web server, then save it in an XML file?

I am studying computer science and we have to do a programming project which must be strongly related to XML and using XSD and XSLT or XQuery/XPath at least. Because I like C# I'd like to do it in this language, but I could use another if anyone has another idea.
My Idea is now to code some kind of appointment book. I imagine that all appointments for the week are shown as HTML and you can enter for each day appointment notes in the textarea for this day.
Now my question: How can I take over the data entered in the textboxes? The application is an offline one so I have no web server receiving the GET request containing the entered data. Is it possible to read the current HTML DOM from memory with all its entered values and then transform it to an XML format for persistent storage from which it could be read in later?
Or is this idea totally stupid?
How else can I put all those XML technologies in one app?

If you want to show UI Generation from XSLT, the web page approach is easiest.
More impressive is generation of XAML from XSLT -> windows app (WPF).
Download Visual Web Developer (FREE)
or
Visual C#

Why does it have to be Web based?
You can use those technologies in a Windows Application.

You can use JavaScript. Convert the data into XML or JSON and output it to another element, like div, or textarea.
What you need to do is set a function that does all this and gets executed on submit.
Check this example. Also to speed things up, you can use a library like jQuery.

Being at home and offline do not mean you don't have a Web server. There are zillions of ready-made packages which offer an embedded HTTP server so that the same application can run online and offline without any modification. Very convenient.
(I know you us C# but, just to show an example, I use wsgiref.simple_server for that purpose.)

Why not make a windows app that allows the user to update the appointments which are stored in an XML file. Then use a stylesheet to display the appointments in a web browser.