i already did in VB few month ago, and i want to do the same in C#. the function insert in DB the info i get in excel and works well. ' example in VB public function myFunction(byval LastName as string, byval FirstName as string, optional Email as string="NA", optional PhoneNbr as long=0) end function // now how can i do the same in C#? i can do with polymorphiste but if some function have 20 argument, i need 400 different functions to do the equivalent of vb? the missing value work, but i need to put all the argument in object type. Fardoche