Turn on Includeexceptiondetailinfaults (Either from Servicebehaviorattribute or from the <Servicedebug> Configuration Behavior) on the Server

Turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the serviceDebug configuration behavior) on the server

Define a behavior in your .config file:

<configuration>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="debug">
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    ...
  </system.serviceModel>
</configuration>

Then apply the behavior to your service along these lines:

<configuration>
  <system.serviceModel>
    ...
    <services>
      <service name="MyServiceName" behaviorConfiguration="debug" />
    </services>
  </system.serviceModel>
</configuration>

You can also set it programmatically. See this question.

Set IncludeExceptionDetailInFaults to true in code for WCF

Yes, sure - on the server side, before you open the service host. This would however require that you self-host the WCF service - won't work in IIS hosting scenarios:

ServiceHost host = new ServiceHost(typeof(MyWCFService));

ServiceDebugBehavior debug = host.Description.Behaviors.Find<ServiceDebugBehavior>();

// if not found - add behavior with setting turned on 
if (debug == null)
{
    host.Description.Behaviors.Add(
         new ServiceDebugBehavior() { IncludeExceptionDetailInFaults = true });
}
else
{  
    // make sure setting is turned ON
    if (!debug.IncludeExceptionDetailInFaults)
    {
        debug.IncludeExceptionDetailInFaults = true;
    }
}

host.Open();

If you need to do the same thing in IIS hosting, you'll have to create your own custom MyServiceHost descendant and a suitable MyServiceHostFactory that would instantiate such a custom service host, and reference this custom service host factory in your *.svc file.

Getting error while invoking WCF service from MVC project

Your WCF service throwing an exception. Change this in your WCF config to get the exception message from service:

      <serviceDebug includeExceptionDetailInFaults="true"/>

You will want to change this back to false when deploying to production environment.

HTH

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