Code based destination rule

I want to use code to decide on my destinations, so I've taken a simple destination rule that says I'm the destination of an activity, clicked generate code, switched to use code, and now I get an error that the email is not found. I haven't modified the generated code at all. When I was using the GUI instead of the generated code it worked fine. Here is the generated code:

public void Main(ref DestinationRuleContext K2) {


 SourceCode.K2Utilities.DSHelper oDSH = new SourceCode.K2Utilities.DSHelper(SourceCode.K2Utilities.DSHelper.DSHelperNewOptionsEnum.DefaultLDAPDomain);
 System.DirectoryServices.DirectoryEntry oDEManager;
 string sManager;
 bool bAllTrue = true;
 CDest1 oDest1 = new CDest1();
 oDest1.Main(ref K2);
 if (oDest1.IsSuccess == true) {
 //== sendto
     K2.Destinations.Add(DestinationType.User, @"RUSHENTFransellaJ");

     if (bAllTrue == false) return;
 }
}

// Destination Classes

private class CDest1 {
 public bool IsSuccess = false;

 public void Main(ref DestinationRuleContext K2) {
  this.IsSuccess = true;
 }

}