wcf - Why does a Web Service DataMember's Specified Attribute need to be set for int and Data but not for String -

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I have created a web service through WCF, after which I have highlighted it as a web service, which is a . Make usable with the NET 2.0 application. I have created some data contracts with the datamember which can be used by the Exploration Operation Contract.

I have noticed that when I try to create a data class in the web service, each attribute for each member of the "specified" attribute is now attributed to each data contract feature.

For example: 

  [DataContract] Public category sales {[Database] Public Invoice Invoice; ...}

When I make an example of a sale in the Web service client, I get the characteristic of the invoice name and the invoice is not specified.

Now my question is, when the attribute is of type string, I do not need to set the corresponding "specified" attribute to the right, but when the type of attribute is an int or datetime, if I If the correct "specified" attribute is not set to true, then the value becomes zero in the web service host. Is there a way to avoid setting specific attributes? Because I need to call web service functions in many places of my code.

The default parameters for the data field feature are: 

  bool EmitDefaultValue (default is true) bool IsRequired (default false)

If the property you are exposing is a non-null value type that you should use:

[IsRequired = true]; Not Public Invoice;

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