Question

semi Resolved

It appears that the problem exists only when running in debug mode,
and only when running the commands thru the immediate / watch windows.

It just works this way.
Thanks for the answers.

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I’m trying to consume a WCF service from .net 2.0 application.
I’ve added it as a web reference, the class appeared in the intellisense.
But, calling a method from the service returns an error of
Cannot call <method> because it is a web method

Service

[ServiceContract]
[AspNetCompatibilityRequirments(RequirmentsMode = ApsNetCompatibilityRequirments.Allowed)]
public class ConsumerResponder
{
    [OperationConract]
    public List<string> GetStrings(int a, int b, int c)
    {
        return new List<string>{"hi"};
    }
}

Services web.config

<?xml version="1.0"?>
<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>

    <system.ServiceModel>

        <behaviors>
            <endpointBehaviors>
                <behavior name="bh1">
                    <endpointDiscovery enabled="true" />
                </behavior>
            </endpointBehaviors>

            <serviceBehaviors>
                <behavior>
                    <serviceDebug includeExceptionDetailInFaults="true" />
                    <serviceMetada httpGetEnabled="true" />
                </behavior>
            </serviceBehaviors>
        </behaviors>

        <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />

        <services>
            <service name="Service.ConsumerResponder">
                <endpoint address="" behaviorConfiguration="bh1" binding="basicHttpBinding" contract="Service.ConsumerResponder" />
                <endpoint address="mex" binding="wsHtppBinding" contract="IMetadataExchange" />
            </service>
        </services>
    </system.ServiceModel>
</configuration>

Usage

using(ConsumerResponder cf = new ConsumerResponder())
{
    List<string> result = cf.GetStrings(1, true, 2, true, 3, true);
}

Tested from another places and in debug, and the service really returns values.

Answer 1

[ServiceContract] 
[AspNetCompatibilityRequirments(RequirmentsMode = ApsNetCompatibilityRequirments.Allowed)] public interface IConsumerResponder { 
    [OperationConract]   
    public List<string> GetStrings(int a, int b, int c);
} 

---

public class ConsumerResponder:IConsumerResponder
{
   public List<string> GetStrings(int a, int b, int c) {  
       return new List<string>;     }
}

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using(ConsumerResponder cf = new ConsumerResponder()) {    
 List<string> = cf.GetStrings(1,2,3); } 

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May be you can try this instead of the class.