How to invoke or start an asp.net web service (asmx) from another project in C#

How to invoke or start an asp.net web service (asmx) from another project
in C#

How do I invoke or start a asp.net web service (asmx) from another project
in C#. The another project can be a console application. I am not asking
to consume the web service (which I am doing in Java) but how to start the
web service in C# but from a different project.
I already tried including the webservice project in my console application
project and also added a reference to the webservice project, included the
namespace but I get an error,
The type 'System.Web.Services.WebService' is defined in an assembly that
is not referenced. You must add a reference to assembly
'System.Web.Services, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a'.
I am trying to invoke the webservice by creating an instant of the
webservice class which I guess is already a wrong way.
Thanks in advance!