| Message property size for a queue, topic, or subscription entity |Entity | The exception **SerializationException** is generated. |Maximum message property size for each property is 32,000. Cumulative size of all properties can't exceed 64,000. This limit applies to the entire header of the [BrokeredMessage](/dotnet/api/microsoft.servicebus.messaging.brokeredmessage), which has both user properties and system properties, such as [SequenceNumber](/dotnet/api/microsoft.servicebus.messaging.brokeredmessage.sequencenumber), [Label](/dotnet/api/microsoft.servicebus.messaging.brokeredmessage.label), and [MessageId](/dotnet/api/microsoft.servicebus.messaging.brokeredmessage.messageid). |
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