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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Totally making assumptions on what/why you are wanting this, I'm inclined to direct you to any C# programmer you may know, and use this API: http://www.mimekit.net/
NOTE:
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Hence, a higher number means a more popular project.