Is there a good working plugin for C# in Eclipse? I\'m using a Linux machine so I do not have access to Visual Studio Express. I already have an Eclipse Environment working
Emonic is an actual eclipse plugin for C#: http://emonic.sourceforge.net/.
Here's a handy guide for how to get it set up: http://www.ibm.com/developerworks/library/os-eclipse-migratenetvs/
Monodevelop is great, but won't meet your requirement not to have to work in multiple IDEs.