Calling Oracle stored procedure in C#???

I'm trying to call a parameterized stored procedure in C# using microsoft ODBC .NET. Could you please give me some help or hint? Thank you very much!

C# code:
... //connection code

odbcCommand.CommandType = CommandType.StoredProcedure;
odbcCommand.CommandText = "BEGIN myProc(?, ?); END;";
odbcCommand.CommandTimeout = 0;

OdbcParameter paramA =
odbcCommand.Parameters.Add("@A_CNT", OdbcType.Int); paramA.Value = _a_cnt;
OdbcParameter paramB =
odbcCommand.Parameters.Add("@B_CNT", OdbcType.Int); paramB.Value = _b_cnt;

try
{
odbcCommand.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.Error.WriteLine(DateTime.Now.ToString() + ex.Message);
throw ex;
}

The SP itself looks like:
CREATE OR REPLACE PROCEDURE myProc (
A_CNT IN BINARY_INTEGER,
B_CNT IN BINARY_INTEGER) AS
BEGIN
NULL;
COMMIT;
END; I tried to directly use
odbcCommand.CommandText = "BEGIN myProc(1, 2); END;"; And that works! However, unfortunately I actually need to use the two variables _a_cnt and _b_cnt as input arguments for the SP. Then I got following error message which complains about the question mark in "BEGIN myProc(?, ?); END;"

ERROR [HY000]
[Oracle][ODBC][Ora]ORA-06550: line 1, column 14:PLS-00103: Encountered the symbol
"" when expecting one of the following: ( ) - + case mod new not null others
<an identifier>
<a double-quoted delimited-identifier> <a bind variable>
table avg count current exists max min prior sql stddev sum variance execute multiset the both leading trailing forall merge year month DAY_ hour minute second timezone_hour timezone_minute timezone_region timezone_abbr time timestamp interval date
<a

The suspicious symbol in the error message is a question mark upside down.

Oracle 10g release 2. Received on Mon Jul 17 2006 - 11:52:08 CDT