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Using .NET: How Can I Edit an HTML Form Input Text box?

I want to use .NET to fill a input text box, that's inside an HTML form inside an IE window.
This HTML form is already open inside an Internet Explorer window. So my program doesn't need to open IE, nor does my program need to open an HTML page because, the HTML page is already open.
Can someone point me in the right direction please - how do I edit an input text box inside an IE window?
Thanks for the help guys!

hardcore version
Look at this thread Simulating Key Press c#
I assume you know layout of the form:
write function that will invoke keypress events InvokeKey, take care of tab and space keys as well
Write a function that will convert string to series of keypress events let's say WriteItForMe(string input) using function in 1.
To fill form do this (example)
WriteItForMe("Michael");
InvokeKey("#tab");
WriteItForMe("Scofield");
InvokeKey("#tab");
etc.

How to show a hyperlink in a text

I have a text which may contain some special characters like <b></b> or a link. I want the user to be able to click on the link and open it. TextBlock or RichTextBox seems doesn't show links in a proper way:
<RichTextBox >
<Paragraph>
click here: http://www.google.com
</Paragraph>
</RichTextBox>
How can I show a text like that in a page?
Update: seems my question isn't clear. I ask a server for content and it returns back to me something like this:
from <b><i><a href="http://www.google.com" rel=nofollow> lorem ipsom
NPR:

 tapped in front of you probably know Bill Gates...
I want to show this in a WINDOWS PHONE page. TextBlock doesn't render it well. how can I show it human readable?

The way to solve your problem I see in using of WebBrowser control.
Then, accordingly to the article, you should go with Javascript to manage the links clicking etc (unless you want the links would be opened automatically with standard logic of Windows Phone):
Script is disabled in the WebBrowser control by default. Set the
IsScriptEnabled property to true if you want to enable scripting in
your control. You can then call scripts using the InvokeScript method.
The ScriptNotify event occurs when JavaScript in the WebBrowser
control passes a string to managed code.
That's a bit tricky way, but if you want to go any other way, you would have to implement your own parser of the code and build the sentence with labels and custom hyperlinks (as in provided above suggestions from comments).

Asp.net c# Button click call a procedure and Also opens in a target_blank

I am trying to make a button that when clicked call a procedure but also opens in a pop-up. I can't find how to do it because all the search i did only tells me to put it on te clientclick :
<asp:Button ID="cmbGen" runat="server" Width="240px" Text="Générer le rapport" OnClick="cmbGen_Click"></asp:Button>
the onclick opens up a pdf, and its not working well on Ie, so, to solve this i would like the pdf to opens in a pop up
not sure what i could do.. anyone got an idea ?
EDIT
The code is pretty big, but basicaly, depending on what checkboxed were checked, it will create a pdf file and show it. this works pretty well, but it opens up in the current page, i would like to make it in a pop-up

A Button always submits a postback to the server on the current window, so you can't directly tie a new window to it. You'll need to write some javascript to do that, and open a popup window.
You can do this lots of ways - you can hook up an event handler to the button so when it's clicked, it immediately opens a new window, and that window is pointed to your server code which returns the PDF. Or you can do a regular postback, and return some javascript that pops up a new window. But either way, javascript is the only way to get a popup from a form button.
Liam's suggestion of making a link instead of a button is probably the simplest method - you can throw an image on that link to make it look like a button if you want.
EDIT
Based on your comment on the other answer, your simplest bet would be to return some javascript on the button click method, using ClientScript.RegisterStartupScript or whatever Microsoft is recommending these days. You can do whatever logic you need to first, then get that into a new handler either through session or querystring parameters, and have the client pop up a new window pointing to that handler.

Can't see you c# so it's not 100% sure what you want but why use a asp:Button at all:
Générer le rapport

Can't find the function body in ASP.NET

I recently started working on a project that has been in development for some time now. The problem is this - in the web site page, a have a frame (amongst 4 others) in a frameset which contains the SVG map object (the whole site is GIS based). Also, in the same frame, there is a icon for opening the form in which user can choose a number of filters, and after he presses a button, the map refreshes and the area of influence around some key points on the map are drawn.
What i need to do is to open that form in a new (popup) window and not in the same frame where the map is. I did that this way:
onclick="window.open('zi.aspx','form1','width=700,height=500,left=350,top=100')"
This works fine. But then, when i enter the filters and hit Generate button, i get this error:
'parent.frames.map' is null or not an object
with the reference to zi.aspx. Now i know that this error is because i changed the form from opening in the same frame as map to opening it in a popup window, but i just can't find anywhere in the code where can i modify it. Before my changes, the code was just this:
onclick="showZi();"
and that is the function i can't find anywhere. Any ideas? How can i make this work, to make a map with filters drawn after the user has chosen appropriate ones from the popup window form? I should mention that this image link is in the ASP.NET table, with standard runat="server" command.

Okay, so you're opening a new window from javascript. Your problem is that you're trying to access the parent window by using the 'window.parent' property. This is wrong, you'll need to instead use 'window.opener' property. E.g.:
window.opener.frames.map

Printing Background Colors from WPF WebBrowser

Currently, I'm printing the contents of a WPF WebBrowser like so:
mshtml.IHTMLDocument2 doc = WebBrowser.Document as mshtml.IHTMLDocument2;
doc.execCommand("Print", true, null);
My HTML content has tables with background colors. Currently, when I print the content, the background colors do not print -- everything is solid white. Is there a way to tell the WebBrowser to print the background colors as well?
Also, this still causes a print dialog to pop up. Does anyone know what the command is to print the contents dialog-less?
Thanks a lot!

Assuming you're using 'SHDocVw.WebBrowser', you can use the ExecWB command. To print without the dialog, use the OLECMDEXECOPT_PROMPTUSER (1) constant. You can also pass an IE print template (just an HTML file) for more control over how the page is displayed.
It's something like this (taken from this MSDN question)
browser.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT,
SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER,
"print_template.html", ref nullObject);
As for the background, it appears to be one of the options you can specify in the print template's LayoutRect. All print dialog settings are stored in the registry, but a print template is preferable because it won't change system-wide settings.