CRM Web Services and .net WCF 4.0 not working

 I have written web services in .net to integrate .net sites to our CRM server. I want to change my present .net web services to WCF Services. I have done the following:

I have downloaded the Users Custom wsdl, Web Services 2.0.

With the wsdl and Visual Studio 2010, I used the .net svcutil utility to create a .net WCF Service class.

I then tried to get some users using the following code in a console app:

UserClient usr = new UserClient();
UserQueryPage_Input objUserQryParam = new UserQueryPage_Input();
UserQueryPage_Output objUserQryOut = new UserQueryPage_Output();

ListOfUserQuery lq = new ListOfUserQuery();
UserQuery uq = new UserQuery();
queryType qt = new queryType();