What is the best tool to create UML diagrams?

[Vijay Kanda]

What is the best (free) tool(s) to create UML diagrams? Thanks.

[Pete OHanlon]

Are you wanting to connect to one from C#?

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[Vijay Kanda]

Pete, Thanks for your respond... Yes, from C#.

[Bernhard Hiller]

There are many types of diagrams in UML! If you are interested in the Class Diagram only, you could use Visual Studio's functionality to create them from your code. But that functionality is very basic only.

[gilvani]

I use StarUML. He is among the best that have ever tested.