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Here are some general steps you can take to test the entire application API in .NET:

1. Identify the API endpoints: Start by listing down all the endpoints of your API. This includes both the public and private endpoints that are exposed by the API.

2. Create test cases: Create test cases for each endpoint based on your understanding of the functionality it serves. This involves creating specific input data that can test the functionality of the API.

3. Execute tests: Execute the test cases on the endpoints to ensure that they perform the right actions and produce the desired results. You can use tools like Postman, Fiddler, and other API testing tools.

4. Test edge cases: Test the API with edge cases to ensure its robustness in handling unexpected inputs and requests.

5. Security testing: Test the API for security vulnerabilities such as SQL injection, cross-site scripting, and authentication and authorization vulnerabilities.

6. Test performance: Test the API for performance issues such as response time, latency, and scalability under high traffic conditions.

7. Continuously iterate: Continuously test and optimize the API as new features are added and changes are made to the application.

Overall, testing the entire application API in .NET requires a systematic approach to ensure that all functionalities are thoroughly tested and optimized for performance, security, and scalability.