i am developing an integration application in .net with salesforce, users are allowded to choose objects and its corresponding fields at run time, after that how to code it dynamically using enterprise WSDL to insert the object by using C#.

i need to insert object from .net at run time,object name and their fields i get to know at run time, how can i code to achieve this functionality

what is the best way or practise to integrate salesforce.com with any other ERP providers like Great Plains Etc