Passing a parameter to stored procedure in c#

When I try the following:
 
Database myDB = DatabaseFactory.CreateDatabase(); DbCommand myCommand = myDB.GetStoredProcCommand("GetPaycheckInfoByPaycheckID"); myCommand.Parameters.Add("@PaycheckID", PaycheckID); I get an error saying No overload for Add method takes 2 arguments. HOw would i pass the PaycheckID in then as a paramter?
Thanks
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