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Execute a SOAP based web services dynamically without generating proxy

In my application, end user can fetch the data from any SOAP based web services and use it in the application. The application provides an option to register the service on fly. The application examine the service, show available operations along with parameter, finally execute the selected operation and use the response, of course everything will be on the fly. There are few steps need to be follow in order to achive that:
Discover the service through WSDL
Examine it and select a method
Build required parameter values
Execute the service
Handle the response
I am able to discover the service on the fly using some WCF classes like DiscoveryClientProtocol, WsdlImporter, ServiceDescription, ServiceContractGenerator, etc. Now, I want to execute them and take the response XML that is available inside SOAP Body.
I am able to execute it by generating the Assembly at runtime using above library and execute a method through reflection. This solution works fine if I have to do everything in single-shot on a box. But it adds complexity when we scale-out. That means, one server generates the proxy, another one use the proxy and consume the services.
Yes, we can keep newly generated assembly somewhere in shared location and use them. But I want to avoid them. We want to keep service definition locally somewhere in DB, execute it without generating assembly and just consume the XML available inside SOAP body.
Appreciate the advice in advance on how to achieve this?

To communicate with WCF services without code generation you use the ChannelFactory< T > where T is the service interface.
Obviously in your case the service interface is not known at compile time so your objective would be to dynamically generate this type, or better yet use a custom ChannelFactory implementation that does not rely on strong typing and lets you call methods in a dynamic or programmatic way.
You can use the WsdlImporter to import the WSDL at runtime and which can give you the ContractDescriptions. From there you might be able to use ContractType as your service interface but I'm not sure. You may need to write your own ChannelFactory...

You can implement ChannelFactory to your abstract generic BaseFactory class which has override CreateDescription method to set Binding and Endpoint for ChannelFactory.ServiceEndpoint. You can pass your configuration interface which has Binding, Endpoint and Credentials to this abstract class. So you can have a dynamic proxy for a wcf service.

How to generate proxy class from WSDL in case of webservice

suppose when i have only wsdl file then how can i create proxy class just to call webservice various method. how webservice related all class and its property & method will be exposed in my c# apps. can anyone help guiding me. thanks

You would need to use the ServiceModel Metadata Utility Tool, or Visual Studio's Add Service Reference Dialog in order to generate a client proxy for the service with which you want to communicate. The generated proxy will provide classes that abstract the service contract, and you can program your client applications to interact with these classes.

There is an utility, it shipps with Visual Studio (since 2005, I think), called wsdl.exe
It's commandline, and can be used to generate proxy.

You can use WSDL.exe tool using command line.
i.e. WseWsdl3 WSDLPath /out:MyProxyClass.cs

if WseWsdl3.exe is unable to create the proxy class, there is still a way.
If you can run your service as a regular ASP.NET web application in IIS, it creates temporary ASP.NET files where the proxy class is nicely generated for you.
You can find it in folder:
C:\Windows\Microsoft.NET\Framework\vMAJOR.MINOR.BUILD\Temporary
ASP.NET Files\YOUR_WEB_APP.
There are some subfolders with random names, go to most recent one and look something like "App_WebReferences.XXXX.0.cs".

SOAP WebService... How?

I have a sharepoint web service running at specified host + "/_vti_bin/UserProfileWebService.asmx". I would like to instantiate a web service client, so that i could interact with this service. This is basically what I am trying to do: http://msdn.microsoft.com/en-us/library/ms550407.aspx.
How is this done in .NET? And do I have to use the MOSS API to know what functions it supports?
EDIT:
I guess I should add that I want to connect programmatically, not through a web reference, because that seems to be static.

In VS (2008/2010) you can add a web service reference to your console project for example. It will auto-generate the proxy classes for you to use in your code.

Can I have a WCF call that hits the DB use the creds of the caller?

I have read a lot about impersonation, and I have tried a ton of tags in my config file. I have tried [OperationBehavior(Impersonation = ImpersonationOption.Required)] on my method that hits the database.
None of it works. I get a wide variety of error messages depending on how my config is setup.
Can anyone lay out for me what C# and configuration (ie bindings, behaviors, endpoints settings) is needed to get the following scenario to work:
I call a WCF method via WCFTestClient.
The WCF Method is hosted in IIS (running under an IIS user that is not a valid user in the DB).
That method sees who the caller is and passes those credentials on to the call to the database
The Call to the database is in a different project (a class library) and uses Linq-to-sql
The database performs the action as if the caller of the WCF service had done it.
If anyone has clarified this mystery please share the details with me.
Thanks!
(NOTE: I am developing in Visual Studio 2010 Ultimate and hosting in IIS 7)

There is a nice walkthrough of how to set up impersonation in WCF here. You may be missing the servicebehavior setting?

Dynamic Webservice reference from Class Library used in Winforms app (c#)

Ok - pretty basic scenario, been there before, seemed all so simple - but can't recall enough to work out what's different about the setup at this particular existing codebase.
Winforms App calls Dll which calls Web Service. Reference in the Dll to the Web Service is dynamic. How do I get the URI for the Web Service into a Winforms app.config so I can easily change it for test, dev, live etc.
[Oh just to make it interesting, though I can't see it mattering, the proxy for the web service needs to NOT be regenerated as we have customised it...]

Set the URL directly in your code.
YourServiceProxy service = new YourServiceProxy();
service.Url = ConfigurationManager.AppSettings["YourURLKey"];

Can you configure the web service URI dynamically in code? That way you can easily modify the service to point to the desired location.
You can set the Url property of the webservice in code to point to the URI and use Proxy to set the proxy to your custom proxy.

What's wrong with just copying the URL from the app.config of the library into the app.config of the Windows Forms application?
Also, I'll suggest strongly that you do not modify generated code, ever. You can make many customizations of the proxy by using partial classes. See Ways to Customize your ASMX Client Proxy.