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how to Authenticate WCF service globally using custom token

I wanted to add a global Custom token authentication on each service call in wcf rest service.
My service having more than 50 (Get/Post) methods.
Now I am passing token in each method and authenticate them, Now i wanted to do that globally using something like global.asax or routing or attribute reading
Thank you

For getting the dynamic solution i went through multiple links to understand WCF parameter validation and I found the solution here
Create a class that inherate IparameterInspector
IparameterInspector usesbase class as IoperationBehaviour
Add the created class to your operation contract as a Attribute
For detail descrption see the link
WCF Extensibility using IParameterInspector
If you want you can Comment you query or question to get my actual code for Get and Post method

How to use SOAP service generated class methods?

I have created a SOAP service.
Now i want to consume it in a c# client application. I added the service using 'Add service reference' and service reference is added to client.
All my service entities are in service. And in current scenerio i can't move them to a common library.
Problem is, my service endpoint is accepting List<Foo> as parameter.
Foo has a method Boo.
In client, when i try to Foo.Boo() i get Cannot resolve symbol Boo error.

Unfortunately only methods on the service itself are exposed via a SOAP web service, methods on objects used as parameters or return values are not. If the method relates to a server-side operation then you could expose it at the service root level taking the instance object as parameter, or if it relates to a client-side operation you could consider adding it as a client-side extension method.

DataContract create in WCF

At client side, I have this class without [DataContract]:
public class UserEntity
{
public string login;
public string password;
}
when I put [DataContract] and refresh the reference of this class at WCF side, then I can't initiate the web service. It says an error:
cannot create metadata...
What's wrong?

Are you sure that you actually know, why you can't refresh the reference? I mean you add [DataMember] - and it fails, you remove it - it works? Or it works several days ago and now you add [DataMember] (and many other stuff) and it not works now?
But anyway, the easiest way to solve "refresh reference" issues - to refresh reference manually with SvcUtil.exe. In this case error message would be much more descriptive the simple "oops! error!".

What is client and server side in your case? What is refreshing reference on the WCF side? Your description is very uncommon. Here is description how to create service with complex data type and WCF Class library:
Create WCF class library
Add data contract to the class library
Add service to class library
Implement service contract and service in the class library
Add host project
Reference WCF class library from host project
Host service from class library in host project
Add Metadata endpoint to your hosted service
Create client project
Run the host project outside the visual studio
Use Add service reference to create proxy on WCF service hosted in your host project
Implment code to call your service through created proxy
As you see there is no modification of data contract on the client side and no refreshing WCF service.

What is the Proxy Class

Is a web service reference the proxy class itself? Or is it the classes created inside that you see in object explorer when you look at your web service reference?
example, I created this web service reference
http://www.elbalazo.net/post/TestWebProject%5FObjectExplorer%5FWebReference.jpg
I assume ServiceAuthResponse is one proxy class inside my web service reference?

When you add the WebService reference a proxy class is generated for you.
In your example it looks like LitleWebService will be your service proxy, ServiceAuthResponse sounds more like a data contract that will be used by the service. If you read about the Proxy Design Pattern it may be of some interest
Normally you proxy will inherit from ClientBase, this is where you can specify the service contract.
public class MyProxy : ClientBase<IServiceContract>, IServiceContract

wsdl : Generate Proxy for the WebMethods but not the other dependent classes

Say, I have a WebService SettingsWebService with a WebMethod AddUser(User userObject).
The User class is in the SettingsWebService solution.
When i generate a proxy for the SettingsWebService it creates a class for asmx which contains the AddUser webmethod.
It also generates a class for the User class.
The client now uses
Proxy.AddUser(Proxy.User user)
interface.
Is there any way to tell wsdl to not generate a class for the User class, so that the signature remains :
Proxy.AddUser(SettingsWebService.User
user)
The Client will have a reference to the proxy and the SettingsWebSerice dlls.
Right now I am having to manually remove the code for the User partial class in the proxy and add a usings reference to the WebSettings dll.
Many thanks in advance!

You'll need to add a schemaInmporterExtensions element to your machine.config before generating the proxy. Make this point to the assembly which contains your SettingsWebservice.User class and a proxy will not be generated.

Why you need to do this? If it is a web service you don't need to distribute the SettingsWebService.dll with your code