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Error: The type initializer for 'Oracle.DataAccess.Client. OracleConnectionStringBuilder' threw an exception.

Note:  This is an old article.  However, the troubleshooting tips may still apply to newer versions. 


Testing the connection to a new Oracle data source results in an error message.  However, using an ADO.net Any Source or the local oracle client via TNS connection succeeds.


Error Message:

Connection Failed.  System error description:
The type initializer for 'Oracle.DataAccess.Client.OracleConnectionStringBuilder' threw an exception.


Underlying problem:

There may be a conflict between Oracle Native Client and Oracle Data Provider.



Remove the Oracle Native Client and install only the Oracle Data Provider according to the instructions provided here.

Return to Oracle Troubleshooting Hub

Author: Doug Wynkoop

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