There's been some recent discussion about how to write geometric data out to external data sources.  Here is the most basic on both ends:  xyz coordinates written to a .txt file. Of course, you may want to do some fine tuning of this kind of thing.  Here is a version that cleans up the data, reducing significant digits and other formating.

Andrzej Samsonowicz, Autodesk Applications Engineer, is presenting a 2 part Dynamo webinar, free and open to the public.  Register now, as there are a limited number of seats (and PLEASE only register if you think you are really going to make it!) Dynamo on Revit. The super addin. Part I. General overview. Join us for a Webinar on January

what is dynamo and i am beginner to dynamo how should i start...

You WILL love the formula node in Dynamo.  Resistance is useless.The Formula node is a beautiful thing.  Once you get the hang of how it works, it will replace a number of other nodes.  Lots of folks think that you use it for doing fancy calculations with fancy names like "logarithm" or "law curve", but it's got all sorts of other banal uses.  

Hello Dynamo community, I have begun the process of porting another one of my open source Grasshopper plug-ins over to Dynamo.  Slingshot! for Dynamo features a growing collection of nodes for utilizing relational database management systems.  Slingshot! currently features nodes for connecting to MySQL and SQLite databases.  There are also a few