Error - DataContractAttribute could not be found

The type or namespace name 'DataContractAttribute' could not be found
(are you missing a using directive or an assembly reference?)
The type or namespace name 'DataContract' could not be found (are you
missing a using directive or an assembly reference?)
The type or namespace name 'DataMemberAttribute' could not be found
(are you missing a using directive or an assembly reference?)
The type or namespace name 'DataMember' could not be found (are you
missing a using directive or an assembly reference?)

Solution:

You're just missing a reference to "System.Runtime.Serialization". It's a built-in .NET library, so you can find it under the ".NET" tab of your add references dialog.

 

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