We are looking for some code/component that can create a flow-chart (image) dynamically, preferably in .NET/C# (although a Silverlight/Flash-component that take
MindFusion looks like they have some good diagramming controls that may work for you:
http://www.mindfusion.eu/diagramming.html
Take a look at Microsoft MSAGL
I built a workflow solution a while back and evaluated a number of diagramming controls, including the MindFusion control. I settled on the Syncfusion diagram control, primarily for its ease of use for an end user (especially when drawing connections).
I'm using the WPF edition, but they make editions for ASP.Net and WinForms. It has methods for exporting to images.
These are some of the components that I can remember evaluating; I'd recommend giving them a shot and seeing which you like best.
Syncfusion, NWoods, yWorks, Nevron, EasyDiagram
In the meantime there are also open source diagramming libraries that you can find on Codeplex and Google code.
A very deep one with many features and very flexible is
http://nshape.codeplex.com/
Perhaps easier to program but more limited in scope
http://www.dalssoft.com/diagram/