In the previously published article, Extending Biml with C# scripts, we have explained how to use VB or C# scripts within the Biml code to prevent doing repetitive development work. But in this solution, the C# scripts and classes are only available within a single file while we may need to use them in many.
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![Adding a C# file to the solution](https://s33046.pcdn.co/wp-content/uploads/2020/03/adding-a-c-file-to-the-solution.png)