You can use ODP. Net to implement. net programs to access the database as sysdba.

Oracle ODP. NET database access connection string
 

Connection string attribute	Default Value	Description
Connection lifetime	0	Maximum life time (in seconds) of the connection when the database connection is returned to the connection pool, its creation time will be compared with the current time. If the time exceeds the time specified by the connection lifetime, it will be released. If the value is 0, it is considered as the maximum connection time.
Connection timeout	15	Maximum time (in seconds) to wait for a free connection from the pool
Data Source	Empty string	Oracle Net service name that identifies the database to connect
DBA privilege	Empty string	Administrative privileges: sysdba or sysoper
Decr pool size	1	Controls the number of connections that are closed when an excessive amount of established connections are unused
Enlist	True	Enables or disables Serviced components to automatically enlist in distributed transactions when this value is true, all existing database connections in the pool will be added to the transaction context of its creation thread. If the transaction context does not exist, no changes are made.
Incr pool size	5	Controls the number of connections that are established when all the connections in the pool are used
Max pool size	100	Maximum number of connections in a pool
Min pool size	1	Minimum number of connections in a pool
Password	Empty string	Password for the user specified by user ID
Persist Security info	False	Enables or disables the retrieval of password in the connection string
Pooling	True	Enables or disables Connection Pooling
Proxy user ID	Empty string	User Name of the proxy user
Proxy Password	Empty string	Password of the proxy user
User ID	Empty string	Oracle user name