dxFeed C API and dxFeed C# API version 5.12.0 with fixes and improvements are already available.
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C API Changelog
- The new order source for Cboe C2 Options was added: C2OX
- Fixed bug with concurrent call of `tls_init` function
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C# API Changelog
- The new order source for Cboe C2 Options was added: C2OX
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Please refer to dxFeed Help Desk if you have any questions or concerns.