VB.Net DLL with Excel 2013

Dear,

I have  create a "Class Library" in VB.Net and i am calling this DLL from Excel Sheet. 

THis DLL contains forms which takes some parameters and executes, when the user clicks "Show" in the form of DLL, the data is to be imported to the ActiveSheet from where the DLL has been invoked.

Please let me know some code or links for reference.

Thanks

Sreeram

Madhukar