Cant get the catch statement to catch the custom exception

Question

i have created a custom exception in the business layer and also using wcf layer where I am calling the methods in the business layer then in another website i am calling the method from wcf. i can see the message that i wrote in custom exception but the program goes staright to exception (the second catch block) instead of hitting my first catch block(where the custom exception is) when i hover over the exception i see my message but it's inside something called faultexception which i am not familiar with. and in there under details..there i see type= CanOnlyApplyOnceException. here is my code:

 protected void AddNewApplication()
    {
        try
        {
            using (var proxy = new ServiceReference1.ServiceClient())
            {
                proxy.AddApplication(new Application
                {
                    Credentials = 2,
                    Comments = txtComments.Text,
                });
            }
        }
        catch (CanOnlyApplyOnceException c)
        {
            ErrorSummary.AddError(c.Message, this);
            return;
        }
        catch (Exception)
        {
            lblStatus.Text = "There has been an error.  Please try again";
        }
    }

Answer 1

FaultException is thrown on the client if a service throws an exception.

Depending on the service, you may be able to write

    catch (FaultException<CanOnlyApplyOnceException> c)
    {
        ErrorSummary.AddError(c.Detail.Message, this);
        return;
    }

Answer 2

You need to do 2 things:

1. Add FaultContract attribute on your method declaration on your WCF service like this:

   
   [OperationContract]
   [FaultContract((typeof(CanOnlyApplyOnceException))]
   void AddApplication(Application your_variable_name); 
   

Then make sure you throw exception of type CanOnlyApplyOnceException.

1. Change your catch block to this:

   catch (FaultException<CanOnlyApplyOnceException> c)