Propagating errors from c# dll

[AndrewHunter]

The main question is simple. I have a c# dll I created to act as a plugin for an access solution. What would be a proper OO design pattern for returning error information from the dll to the solution?

I know I use to use things like SetLastError for dlls written in C, however this does not seem to be the optimum solution for an OO pattern. The basic setup is I have a class written in VBA which calls methods within the dll. The methods return true or false depending on whether or not they worked. I would like to be able to get more information as to the nature of the failure if the methods returned false however.

Interface IMyClass
{
     bool  MyMethod();
}
Class MyClass : IMyClass
{
     public bool myMethod()
     {
          if(MyOtherMethod() != null)
          {
               return true;
          }
          else
          {
               return false;
          }
     }
     private dataType MyOtherMethod()
     {
          try
          {
               dosomething;
               return dataType;
          }
          catch(someException e)
          {
               //how do I return this information
               return null;
          }
     }
}

[itsme86]

I like to create a MethodResult class that gets returned. That class might have a bool property called Success.

[AndrewHunter]

I like that idea thanks. So kind of like the OO spin on HRESULT. Thanks!