public And( 
   ConditionalExpression leftExpression,
   ConditionalExpression rightExpression
)

// Create a NetworkAttribute object for the Lifecycle network attribute from the UtilityNetworkDefinition
using (NetworkAttribute lifecycleNetworkAttribute = utilityNetworkDefinition.GetNetworkAttribute("Lifecycle"))
{
  // Create a NetworkAttributeComparison that stops traversal if Lifecycle <> "In Design" (represented by the constant InDesign)
  NetworkAttributeComparison inDesignNetworkAttributeComparison = new NetworkAttributeComparison(lifecycleNetworkAttribute, Operator.NotEqual, InDesign);

  // Create a NetworkAttributeComparison to stop traversal if Lifecycle <> "In Service" (represented by the constant InService)
  NetworkAttributeComparison inServiceNetworkAttributeComparison = new NetworkAttributeComparison(lifecycleNetworkAttribute, Operator.NotEqual, InService);

  // Combine these two comparisons together with "And"
  And lifecycleFilter = new And(inDesignNetworkAttributeComparison, inServiceNetworkAttributeComparison);

  // Final condition stops traversal if Lifecycle <> "In Design" and Lifecycle <> "In Service"
  traceConfiguration.Traversability.Barriers = lifecycleFilter;
}