To identify city names with Azure AI Language, you use the Text Analytics client and its Named Entity Recognition (NER) capability. In the .NET SDK, create a TextAnalyticsClient and call RecognizeEntities(...) . This returns a CategorizedEntityCollection , where each CategorizedEntity has properties such as Text , Category , SubCategory , and ConfidenceScore .

City mentions are recognized under the broader Location category, and the more specific type is surfaced in SubCategory (commonly " City " ). Therefore, iterating the returned entities and filtering with entity.SubCategory.Contains( " City " ) correctly locates city names. Using DocumentAnalysisClient or FormRecognizerClient would be incorrect because those are for document/form extraction scenarios, not general-language NER. QuestionAnsweringClient is for Q & A over knowledge sources. Hence the correct client is TextAnalyticsClient , and the correct discriminator is SubCategory .

Microsoft Azure AI References (titles only)

Azure AI Language – Text Analytics client library: Recognize Entities

Azure AI Language – Named Entity Recognition concepts and categories

Azure AI Language – CategorizedEntity model (Category, SubCategory, ConfidenceScore)