DataMember could not be found

Question

As I have done my research regarding this problem of mine, I still have no luck in solving my error of Error 1 The type or namespace name \'DataMember\' could not be

Answer 1

Remove System.Runtime.Serialization from code, then add from menu > Project > Add reference ..> . Then again add into code. it works.

Answer 2

I have solved the problem. I just removed the System.Runtime.Serialization in the references in the project explorer and affffded it by browsing then it worked. Weird.