The type or namespace name ‘DataContractAttribute’ does not exist in the namespace ‘System.Runtime.Serialization’ (are you missing an assembly reference?)
in Italian:
Il tipo o il nome dello spazio dei nomi ‘DataContractAttribute’ non esiste nello spazio dei nomi ‘System.Runtime.Serialization’; probabilmente manca un riferimento a un assembly
Solution:
Add the following References to your project:
System.Runtime.Serialization
System.ServiceModel.Web
In Solution Explorer, right-click on the project node and click Add Reference to select the dll files.
Remember to add using or Imports lines inside your file.
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