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How would I let 1 .aspx page use another .aspx page's code?

I have 2 aspx files in my project. The first.aspx page has some content on it and when I click on a button, it will launch a frame (second.aspx that only has code to show a calendar) on the same page.
Now once that calendar(second.aspx) loads on first.aspx, I want to click a link on the calendar that will .show() a hidden DIV on the first.aspx page.
How do I access code cross pages? In other words, how can I write some code in second.aspx that will affect first.aspx.

What you're asking for is not really possible. You're probably approaching it the wrong way. What you should do is turn your calendar page into a user control so that it can be used seamlessly in first.aspx.
Here is how to get started with user controls in asp.net:
After you turn it into a user control there are different approaches to getting access to the properties of the user control from your page. Here is one approach using the FindControl method.
Hope that helps.

The easiest solution would be to show and hide your div with jquery. Simple give your div a class like:
<div class="myCalendarDiv" style="display:none" />
And your Button should look like this:
<asp:Button id="myButton" OnClientClick="return ShowCalendar();" runat="server" />
<script type="text/javascript">
function ShowCalendar() {
$(".myCalendarDiv").show();
return false;
}
</script>
Another way would be instead of creating a seprate webpage for the calendar, as proposed you can use a jquery dialog, or make a usercontrol and embedd it on the same page.

(Posted on behalf of the OP).
So since I was dealing with an Iframe, I found out that you can target the parent window which would be first.aspx.
I used "window.parent.MYFUNCTION();" to call my JavaScript function on first.aspx and show the div.

Force html link to open in a new window

There's no easy way to explain this but, I have a website, that links to a online game I've made using asp C#. The website has a link to the game so when the user clicks the link on the site, my game pops up! Simples...
But I want it to pop up in a new Window! but not a browser window... Just... A Window :s
for Example, if you go on www.dofutoshiki.com and click on the "Play Futoshiki in our online player" link, it opens a new window with, just the game. No browser functionality.
I was wondering if anybody out there could shed some light on the subject...
Ive Tried:
Click me!
but it just opens a new tab in the browser!
Thanks!
Alex

If I get this right, you actually want a browser window but without the chrome/UI.
For this, you need to use window.open() (javascript) rather than a target attribute.

http://www.pageresource.com/jscript/jwinopen.htm will help you.
You have to open the new window by using javascript and disabling the unwanted functionality by passing arguments.

You will probably need some javascript for this. What you need to look in to is the
'window.open(...)' function.
Here are a few examples.
And here you can play around with it.

Use javascript Window.open method
Click me!
<script>
function openGame(){
window.open(blahblah.aspx,'Play Game','width=900,height=790,scrollbars=yes,dependent=yes,toolbar=no,location=no,status=no,directories=n o,menubar=no,status=no,resizable=yes');
}
</script>

You can use Jquery popup window plugin it is easy to use and more flexible also.
http://swip.codylindley.com/popupWindowDemo.html

On site you are referring to, browser window is opened. It's configured so that it does not have toolbar, status bar, menu bar, etc.
You can take a look at window opening code in HTML source of the page you are referring to:
<a onClick="window.open(this,'playsample','width=900,height=790,scrollbars=yes,dependent=yes,toolbar=no,location=no,status=no,directories=no,menubar=no,status=no,resizable=yes');return false;">

Is javascript an option?
With javascript it would be something like this:
<a href="#" onclick="window.open('blahblah.aspx', 'game','status=0,toolbar=0,width:400,height:300');" > Click here for the game! </a>

Use this
Click me!
Or even better, put the onclick code in a function of your own so you can reuse it.

Child webpages help

Using C#, ASP.Net
In my webpage i have the link for the another web page, if i click the link that should display a another page inside the main page like child page.
Another webpage should display like a popup window in my webpage. And also size of the another webpage should be small. How to do this.
Need Help.

For displaying one web page within another look at using frames (or an inline frame - iFrame)
The second part of your question I think is asking to be able to display the link in a separate window. To do this, use the target="blank" attribute in the anchor tag. to set the size of the child window you will need to use javascript:
<script type="text/javascript">
function showPopup(url) {
newwindow=window.open(url,'name','height=190,width=520,top=200,left=300,resizable');
if (window.focus) {newwindow.focus()}
}
</script>
So just call the showPopup method from your anchor click event
link text
Ideally you would move the javascript so that it is no longer inline, but this should work.

For the first part you need a master page
For the second part you might need a modal popup or it's jQuery equivalent
However, I don't understand what you mean with
And also size of the another webpage should be small. How to do this.

Another webpage should display like a
popup window in my webpage. And also
size of the another webpage should be
small. How to do this.
Did you mean a jQuery Modal Window?

Ajax Content Loading(Processing) image or indicator

in part of my web page, I have couple of asp:image Thumbnails, onclick I use ajax modal popup extender to show the imgae in full size which are working fine, what I need to add is to have a processing image or indicator both in thumbnail and modal popup extender,
I also have ajax autocomplete that is working fine, I need to add some indicator or processing image to it as soon as user start typing a word.
any idea?
Thanks in advance

You can use an update progress control to display a progress template within your update panel. It displays the contents of the ProgressTemplate tag whenever a postback occurs:
<asp:UpdateProgress runat="server" id="UpdateProgress" AssociatedUpdatePanelID="SomePanel" >
<ProgressTemplate>
<img src="processing.gif" alt="Processing" />
</ProgressTemplate>
</asp:UpdateProgress>
Also, I've found Preloaders useful as a source of animated GIFs for this purpose.

Look at http://www.ajaxload.info/. There are a ton of images there. Once the user types in some letters, however many you need, then display the ajax loader gif next to the textbox.

Assuming that you want the loader/indicator within control, so, one way could be to subclass the PopupExtender control, add asp:UpdateProgress, and put a loader.img in there.

About modal pop control to the ajax control tool kit

First of all hi too member
now my 1st talk i had one ajax control tool kit tht doesnt work on the vs 2008
so please help me for tht and
other problem I had make one modal pop code for the site but it nt working properly
mean when I click on the button it will only display Loader image but it did nt display tht page or div tag which cover the whole page with black color
so i need that back ground color div tag
Some please help me
I am badly stuck with this problem
in advance thank you

If I have deciphered your post correctly, you can show the ModalDialog but it doesn't "color" the rest of the page, therefore making the popup non-Modal?
If this is the case, then you need set the BackgroundCssClass attribute of the ModalPopupExtender to a valid CSS class.
I normally use this...
.ModalBackground
{
background-color:Gray;
filter:alpha(opacity=50);
-moz-opacity:0.5;
-khtml-opacity: 0.5;
opacity: 0.5;
}
<ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server" BackgroundCssClass="ModalBackground" [... the rest of the attributes....] />