Creation of RFC destinations at runtime

Hi Experts,

I am trying to develop application in 7.3 NWDS which should connect to two ECC systems at run time. I created a ARFC2 model and trying to instantiate

the model with two parameters to pass system name and system client of ECC system.

I wrote like this :  TestModel testMdl = new TestModel(sysName,sysClient);

But I am getting error like : The constructor TestModel(String, String) is undefined.

I referred these to do the activity :

http://service.sap.com/sap/support/notes/1920259

Change ARFC2 Model RFC Destination at runtime

Please suggest me how to resolve it...

Regards,

Prasanna