Need advice: How to implement dynamic workflow creation

I am going to implement a user editable workflow.

They should support if/then clauses and perhaps cycles. The operation Domain is not editable and will contain predefined set of operations like: Send Email, Notify, Messag开发者_Python百科e etc. These operations will have parameters.

P.S. If you have experience with implementing something like this, please share it.

Check this: Design workflows for WF4 in Silverlight

and this on codeplex: workflow designer developed in silverlight .

http://sharedesigner.codeplex.com/releases/view/32301

you could use WF ( Workflow Foundation ) to model and execute your workflow.