"False" is the only valid value for disabling MARS.
In general, existing applications should not need modification to use a MARS-enabled connection.
However, if you wish to use MARS features in your applications, you should understand the following special considerations.
The following connection strings use the sample Adventure Works database included with SQL Server.
The connection strings provided assume that the database is installed on a server named MSSQL1.
Multiple Active Result Sets (MARS) is a feature that works with SQL Server to allow the execution of multiple batches on a single connection.