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How did I solve the Json serializing circular reference error?
public class MyObjectContext : DbContext, IDbContext
{
     public MyObjectContext(string connectionStringName) : base(connectionStringName)
     {
        ((IObjectContextAdapter)this).ObjectContext.ContextOptions.ProxyCreationEnabled = false;
     }
     public DbSet<Product> Products {get;set;}
     //etc.
}