Object must implement IConvertible.

i have an application that uses a stored procedure to add the data into a table on the SQL Server. the fields text are sent via parameters (contain varchar and datetime). when saving the data to the server i get the error (exception) 'object must implement IConvertible'.
what must i do to correct this error. i've notice that it is triggered when the IRSComm.ExecuteNonQuery() is executed.
please help!!!

You are propably missing: IRSComm.CommandType = CommandType.StoredProcedure in your code? tsami