expose method contained in dll through Webservice using c#

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webservice

Hi All,
I want to expose a method contained in a dll that had created in VS2005. I have to use vs2010(language C# .net) and have to create a web service that can expose methods contained in that dll. I am mentioning 1 function that i want to expose using c#.

GetMangerName(string a, string b, BSTR *s){
}
this function returns a string and receive 2 string as a parameter and 1 pointer.This same function I want to expose using c# and when we click to this method it should access the functionality of dll.