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Home/ Questions/Q 3876216
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Editorial Team
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Editorial Team
Asked: May 19, 20262026-05-19T22:21:22+00:00 2026-05-19T22:21:22+00:00

In .NET is there any way to convert from three letter country codes (defined

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In .NET is there any way to convert from three letter country codes (defined in ISO 3166-1 alpha-3) to two letter language codes (defined in ISO 3166-1 alpha-2) eg. convert BEL to BE?

Have looked at the RegionInfo class in System.Globalization but the constructor does not seem to support the three letter codes.

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  1. Editorial Team
    Editorial Team
    2026-05-19T22:21:23+00:00Added an answer on May 19, 2026 at 10:21 pm

    The RegionInfo class does know the three-letter code (in the ThreeLetterISORegionName property), but I don’t think there is a way to get RegionInfo based on this code, you would need to enumerate all regions and add them to your own dictionary, with the three-letter code as a key.

    However, I think the .NET Framework uses RegionInfo to work with cultures, not countries in the ISO 3166-1 sense. Therefore, many countries from the ISO 3166-1 standard are not available (try e.g. SX). I guess you should create your own country codebook.

    Edit: From 246 countries in my current country codebook, RegionInfo is available for 125 of them, the rest (121) are not supported. Conclusion: This is not a good way to get a country codebook.

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