Hello P. Saravanan,
Ofbiz is mostly written in Java, Groovy and its own XML domain specific languages. It does not directly support C# or .NET - in other words, you can't call the functions in Ofbiz with C# method calls.
However, Ofbiz implements a service interface, so there is a separation between the "engine" that does the work and the user interface. If you want to keep your C# application and call on Ofbiz services, you will need to use some form of remote procedure call or web service. There are several to choose from.
Microsoft supply tools in Studio and the .NET framework to make it easy to call web services using SOAP (Simple Object Access Protocol). WCF, a component of .NET 3 and later versions, supports REST (Representational State Transfer) as well.
I haven't needed to call Ofbiz from another application, so I don't have experience in this area, but some people on the mailing list have suggested XML-RPC works better than SOAP. The trouble from your perspective is XML-RPC is not provided in the .NET Framework so you'll need to find a third party component such as XML-RPC.NET (www.xml-rpc.net).
See the section Soap / XML-RPC / REST in
https://cwiki.apache.org/OFBIZ/faq-tips-tricks-cookbook-howto.html to get started.
Hope this helps.
Paul Foxworthy
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