.NET maintains its own table of characters and their corresponding categories, which ensures that a specific version of a .NET implementation running on different platforms returns identical character category information. On all .NET versions and across all OS platforms, character category information is provided by the [Unicode Character Database](https://www.unicode.org/ucd/).

The following table lists .NET versions and the versions of the Unicode Standard on which their character categories are based.

|.NET version|Version of the Unicode Standard|
|----------------------------|-------------------------------------|
|.NET Framework 1.1|[The Unicode Standard, Version 4.0.0](https://www.unicode.org/versions/Unicode4.0.0/)|
|.NET Framework 2.0|[The Unicode Standard, Version 5.0.0](https://www.unicode.org/versions/Unicode5.0.0)|
|.NET Framework 3.5|[The Unicode Standard, Version 5.0.0](https://www.unicode.org/versions/Unicode5.0.0)|
|.NET Framework 4|[The Unicode Standard, Version 5.0.0](https://www.unicode.org/versions/Unicode5.0.0)|
|.NET Framework 4.5|[The Unicode Standard, Version 6.3.0](https://www.unicode.org/versions/Unicode6.3.0/)|
|.NET Framework 4.5.1|[The Unicode Standard, Version 6.3.0](https://www.unicode.org/versions/Unicode6.3.0/)|
|.NET Framework 4.5.2|[The Unicode Standard, Version 6.3.0](https://www.unicode.org/versions/Unicode6.3.0/)|
|.NET Framework 4.6|[The Unicode Standard, Version 6.3.0](https://www.unicode.org/versions/Unicode6.3.0/)|
|.NET Framework 4.6.1|[The Unicode Standard, Version 6.3.0](https://www.unicode.org/versions/Unicode6.3.0/)|
|.NET Framework 4.6.2 and later versions|[The Unicode Standard, Version 8.0.0](https://www.unicode.org/versions/Unicode8.0.0/)|
|.NET Core 2.1|[The Unicode Standard, Version 8.0.0](https://www.unicode.org/versions/Unicode8.0.0/)|
|.NET Core 3.1|[The Unicode Standard, Version 11.0.0](https://www.unicode.org/versions/Unicode11.0.0/)|
|.NET 5|[The Unicode Standard, Version 13.0.0](https://www.unicode.org/versions/Unicode13.0.0/)|