try

{

    using (TransactionScope transactionScope = new TransactionScope())

    {

        WriteToCloudDatabase(input);

        transactionScope.Complete();

    }

}

catch (TransactionException)

{

    // If something wrong happens while committing the transaction,

    // it will rollback and throw this exception.

}

catch (Exception)

{

    // If something wrong happens before committing the transaction,

    // it will rollback and that exception will be caught in here.

}