In our organization, we are still on .net 1.1 environment, using javascript, a few open source applications/widgets. Development is done using Visual Studio 2003, grid view, and iframes. Our application works in Internet Explorer 7 and IE 8 (in compatibilily mode). Can anyone give any basic steps we can take to get our application to work cross browsers? What are the starting locations we can get at to start making existing code work in different browsers?
['https://Stackoverflow.com/questions/2568467', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/-1/']
Make your HTML markup standards compliant. I find that developing my website following W3C standards ensure that my sites work in all major browsers.

I also develop in Firefox and then fix IE using conditional stylesheets.

The .NET version does not matter on browser compatibility.
.Net in its 2.0 iteration got *a lot* better (compared to 1.1) at producing cross-browser, and certainly *more* standards-compliant code (although not perfect by any means). 

If you can upgrade to 2.0 this will get you a lot of progress on the standards compliance front for free (unless your own controls / html render as non-cross-browser html and/or javascript; then that would be the first main problem to tackle).

In .Net 2.0 don't forget to appropriately set the `xhtmlconformance` [attribute](http://msdn.microsoft.com/en-us/library/ms228268.aspx) in your `web.config` (if you're for example aiming for xhtml). This globally affects the produced html your controls produce.