C# - Error CS0246 - The type or namespace name 'DataMember' could not be found
If you get this error, you are missing an assembly reference.
Fix with: Project ... Add Reference ... System.Runtime.Serialization.dll
![[error-cs0246.gif]](images/error-cs0246.gif)
Why?
The class DataMemberAttribute, which can be found in the namespace System.Runtime.Serialization, is implemented in the assembly System.Runtime.Serialization.dll.
That assembly is not referenced by default.