Register the Oracle.DataAccess.dll assembly

You must register the Oracle.DataAccess.dll assembly to the Global Assembly Cache (GAC) for .NET version 4:
  1. Open a command prompt as an Administrator.
  2. Set a value for ORACLE_CLIENT_HOME if it is not defined.
    For example, set ORACLE_CLIENT_HOME=C:\app\oracle\product\19c\client_1
  3. Navigate to %ORACLE_CLIENT_HOME%\ODP.NET\bin\4
  4. Execute the following commands:
    OraProvCfg.exe/action:config  /force /product:odp /frameworkversion:v4.0.30319 /providerpath:Oracle.DataAccess.dll
OraProvCfg.exe /action:config  /force /product:odp /frameworkversion:v4.0.30319 /providerpath:%ORACLE_CLIENT_HOME%\odp.net\bin\4\Oracle.DataAccess.dll
OraProvCfg.exe /action:gac /providerpath:%ORACLE_CLIENT_HOME%\odp.net\bin\4\Oracle.DataAccess.dll
OraProvCfg.exe /action:gac /providerpath:%ORACLE_CLIENT_HOME%\odp.net\PublisherPolicy\4\Policy.4.112.Oracle.DataAccess.dll
OraProvCfg.exe /action:gac /providerpath:%ORACLE_CLIENT_HOME%\odp.net\PublisherPolicy\4\Policy.4.121.Oracle.DataAccess.dll
OraProvCfg.exe /action:gac /providerpath:%ORACLE_CLIENT_HOME%\odp.net\PublisherPolicy\4\Policy.4.122.Oracle.DataAccess.dll

Parent topic: Installing and configuring the Oracle database client