C# Extension.SelectByID2

Hi,

I have a code here 

boolstatus = modelDoc.Extension.SelectByID2( " ", "FACE", 0, 0, 0, false, 0, null, 0);

I want to select a face of the body what should I put in the " ",  example I put "Face<1>@UpperSquare.SLDPRT", but it doesn't select.

Thanks!

SolidworksApi macros