There are several NoSQL databases that can be used with C#. Some of the popular options include:
1. MongoDB: MongoDB is a document database that provides high performance, scalability, and flexibility. It is widely used in the industry and has a strong developer community. MongoDB provides a C# driver that allows you to easily interact with the database.
2. Couchbase: Couchbase is a distributed NoSQL database that can handle large amounts of data with high performance. It offers features like data replication, automatic sharding, and support for caching. Couchbase provides a .NET SDK that enables you to work with the database using C#.
3. RavenDB: RavenDB is a document-oriented database that combines the benefits of NoSQL databases with the flexibility of SQL-like queries. It offers features like ACID transactions, sharding, and replication. RavenDB provides a client library for .NET that allows you to interact with the database using C#.
4. Cassandra: Apache Cassandra is a highly scalable and distributed NoSQL database that can handle large amounts of data across multiple machines. It provides a C# driver called DataStax C# Driver that allows you to interact with the database using C#.
These are just a few examples of NoSQL databases that can be used with C#. Each database has its own features and strengths, so it is important to evaluate them based on your specific requirements before making a decision.