ADODB.Recordset

Hi!

can someone help mi by explaining the purpose of the code given below?not sure if this is related to SQL or C++ though...

_RecordsetPtr pRs(__uuidof(Recordset));
IADORecordBinding *picRs = NULL;
ExerciseRs rs;

hr=pRs->Open(queryString,connectionString,adOpenStatic,adLockOptimistic,adCmdUnknown);

when i execute the program, there's a bug.An error comes out from the exception saying that the source is from ADOBD. Recordset.
The description: Item cannot be found in the collection corresponding to the requested name or ordinal.

I do not understand this.Pls help by explaining this to me or direct me to some help or how i can solve this. Thanks a lot!!