See this article , very nice one
http://blogs.msdn.com/jonasd/archive/2008/01/21/Creating-a-no_2D00_code-workflow-for-CRM-4.0-with-Visual-Studio-2005-_2800_2008_2900_.aspx
Regards,
Imran
HI,
You can create workflow assemblies using Visual studio, then you need to setup the workflows in CRM.
Please have a look at:
Sample Code: http://msdn.microsoft.com/en-au/library/bb955385.aspx
Custom Workflow Activity Sample Code: http://msdn.microsoft.com/en-au/library/cc151229.aspx