CLR/C# equivalent to XACT_STATE()

I am porting a set of T-SQL stored procedures to C#/CLR. In the T-SQL, we use XACT_STATE() to determine if an error requires rolling back to a savepoint or rolling back the transaction entirely.

I cannot find an equivalent check of the transaction using the System.Data.SqlClient.SqlTransaction or System.Transactions.TransactionScope objects.

Does anyone know how to check the transaction state from within C#/CLR?