Currently the .NET connector requires select privs on mysql.proc to execute an sproc. This parameter would allow the user to avoid that by adding the parameters to the command object in the correct order.
This was implemented by adding a connection string parameter named "use procedure bodies". False means the connector should not attempt to query the procedure body and parse parameters. The result of this is that users of the provider who choose this mode must specify their parameters in the exact same order as defined in the procedure and each parameter must have a type set.