Невозможно наследовать две различные операции с одинаковым именем. Операция "<var>X</var>" из контрактов "<var>Y</var>" и "<var>Z</var>" нарушает это правило. Можно изменить имя одной из операций путем изменения имени метода или с помощью свойства Name атрибута OperationContractAttribute.

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Cannot inherit two different operations with the same name, operation '<var>X</var>' from contracts '<var>Y</var>' and '<var>Z</var>' violate this rule. You can change the name of one of the operations by changing the method name or by using the Name property of OperationContractAttribute.

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