Derive a class from the classes, and override the methods, and attribute
them as WebMethod.

Something like:

public class MyWebClass: WebService, MyBaseClass
{

   [WebMethod]
   public override int MyMethod()
   {
       return base.MyMethod();
   }
}

i do that by putting the class library in a virtual sub directory bin
and define in the web.config

<system.runtime.remoting>
     <application>
        <service>
           <wellknown
              mode="SingleCall" objectUri="DASefer.soap"
              type="MyNameSpace.MyClass,AssemblyName"/>
        </service>
        <channels>
           <channel ref="http"/>
        </channels>
     </application>
  </system.runtime.remoting>
but i have a problem in classes that return a dataSet
when i try to add the web refernce to that class i have the error:
error: Unable to import WebService/Schema. Unable to import binding
'DAKoreBinding' from namespace
'http://schemas.microsoft.com/clr/nsassem/SeferDAccess/SeferDAccess%2C%20Version%
3D1.0.1934.18680%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull'.
Unable to import operation 'KoreDetails'. The datatype 'DataSet' is missing.

are any one know what i do rong???