Implement this method to check if the given instance represents a valid server of this service. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Parameters
- server
-  Type:  Autodesk.Revit.DB.ExternalService IExternalServer  
 An instance of a server that is to be validated.
Return Value
True if the server is valid, False otherwiseRemarks
 This method is invoked by the framework upon registration of a server for this service. The simplest implementation would be to test whether the type of the object is as expected, but a service may have other rules for validating its servers.