UserDynamicAttributeUpdateResponseUserDynamicAttribute Property

public WSUserDynamicAttribute UserDynamicAttribute { get; set; }

This UserDynamicAttribute object will be essentially identical to the one in the request, and serves merely as a confirmation that the database was updated. Note that the value field in this object is the new value, not the old one. If you need to keep track of what the value was before it was changed, you have to retrieve it from the database first.