Hi, @DesarrolloMX Welcome to the Microsoft Q&A Platform, and thanks for your query.
As I understand you are looking for a Tutorial that helps to connect PostresSQL with C# and create CRUD.
For Azure Postgres Single server please refer to this document Here
For Azure Postgres Flexible server please refer to this document Here
And here is the document for Hyperscale
For Postgres, Hyperscale select the connection string under settings and use the parameters mentioned for ADO.NET
Please let me know if you need any additional information.
Regards
Geetha
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