The type or namespace name IExcelDataReader could not be found

Hi,
Can anybody help me please how to resolve this problem: The type or namespace name IExcelDataReader could not be found?
I have 
using Excel = Microsoft.Office.Interop.Excel; 
and than in if(!Page.IsPostback) block I have
   IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
where I get the message  "The type or namespace name IExcelDataReader could not be found".
I also added reference to Microsoft Excel 15.0 Object Library from Com in Reference Manager.
Thanks
P.S. I read some articles that I should first create a library and than add an Excell .dll file to that library and the insert reference, but I don't know how.