Writing SQL databases using C# involves using the .NET framework and its libraries to interact with a database management system such as Microsoft SQL Server or MySQL.

There are various ways to achieve this, including using Entity Framework, a popular Object-Relational Mapping (ORM) tool that simplifies database interactions by providing an abstract layer between the application and the database. Other options include using ADO.NET, which provides a low-level data access API for working with databases.

Overall, the approach you choose will depend on the specific needs of your project and your familiarity with different tools and libraries. It's important to consider factors such as performance, scalability, and security when selecting a database and designing your application's data access layer.

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