Download file from filenet IDM using IDM objects

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C#

i have code to download file from FileNet IDM server. using IDM docid but i want to pass property field and download it. what idmobjects should i use it.?

please help on this. am new to IDM.

fnObjectType = IDMObjects.idmObjectType.idmObjTypeDocument;           

        int pagec = 0;
        try
        {
            fnGenericObj = fnLibrary.GetObject(fnObjectType, argDocid,
                                     objMissing, objMissing, objMissing);
            fnDoc = (IDMObjects.Document)fnGenericObj;
            pagec = fnDoc.PageCount;
        }

What I have tried:

i have code to download file from FileNet IDM server. using IDM docid but i want to pass property field and download it. what idmobjects should i use it.?

please help on this. am new to IDM.