The answer is to use Environment.GetEnvironmentVariable("SQLAZURECONNSTR_MyConn") because Azure App Service automatically injects connection strings defined in the portal’s Connection Strings blade as environment variables, prepending a type-specific prefix like SQLAZURECONNSTR_ for SQL Azure. This is the recommended approach for accessing connection strings in app code, as it leverages the platform’s secure, managed configuration rather than reading from app settings or config files directly. On the AZ-204 exam, this tests your understanding of how App Service handles connection strings differently from standard app settings—a common trap is trying to read them via ConfigurationManager or IConfiguration without the prefix, which fails. Remember the mnemonic: “Prefix points to the platform’s path”—the prefix (e.g., SQLAZURECONNSTR_, MySQLCONNSTR_) tells your code which database type the string targets, and you must include it in the environment variable name to retrieve the value correctly.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are developing a web app that runs on Azure App Service. The app needs to read a connection string from configuration. Which is the recommended approach to access the connection string in the app code?
Why wrong: Wrong: There is no public endpoint to retrieve connection strings.
B
Use Environment.GetEnvironmentVariable("SQLAZURECONNSTR_MyConn")
Correct: App Service prefixes connection strings with the type, and they are available as environment variables.
C
Use Azure.Identity.DefaultAzureCredential and Key Vault
Why wrong: Wrong: While Key Vault is a valid approach, it is not the direct recommended way to read an App Service connection string configured in the portal.
D
Read from appsettings.json using IConfiguration
Why wrong: Wrong: appsettings.json is for local development; secrets should not be stored in source control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Environment.GetEnvironmentVariable("SQLAZURECONNSTR_MyConn")
Option B is correct because Azure App Service automatically injects connection strings defined in the 'Connection strings' blade as environment variables with a specific prefix. For SQL Azure, the prefix is 'SQLAZURECONNSTR_', so the environment variable name becomes 'SQLAZURECONNSTR_MyConn'. Using Environment.GetEnvironmentVariable is the recommended way to retrieve these values at runtime, as they are securely stored and managed by the platform.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Call an HTTP endpoint on the App Service instance
Why it's wrong here
Wrong: There is no public endpoint to retrieve connection strings.
✓
Use Environment.GetEnvironmentVariable("SQLAZURECONNSTR_MyConn")
Why this is correct
Correct: App Service prefixes connection strings with the type, and they are available as environment variables.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Azure.Identity.DefaultAzureCredential and Key Vault
Why it's wrong here
Wrong: While Key Vault is a valid approach, it is not the direct recommended way to read an App Service connection string configured in the portal.
✗
Read from appsettings.json using IConfiguration
Why it's wrong here
Wrong: appsettings.json is for local development; secrets should not be stored in source control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume IConfiguration or appsettings.json is the primary source for connection strings, but Azure App Service overrides these with environment variables when connection strings are configured in the portal, and the exam expects you to know the specific prefix-based environment variable naming convention.
Detailed technical explanation
How to think about this question
Under the hood, App Service sets environment variables with type-specific prefixes: 'SQLAZURECONNSTR_' for SQL Azure, 'SQLCONNSTR_' for SQL Server, 'MYSQLCONNSTR_' for MySQL, 'POSTGRESQLCONNSTR_' for PostgreSQL, and 'CUSTOMCONNSTR_' for custom types. The .NET configuration system can also read these if you call AddEnvironmentVariables(), but the direct Environment.GetEnvironmentVariable call is the most straightforward and works across all frameworks. In a real-world scenario, if you need to rotate a connection string without redeploying, updating it in the portal automatically changes the environment variable on the next restart, making this approach ideal for production.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Environment.GetEnvironmentVariable("SQLAZURECONNSTR_MyConn") — Option B is correct because Azure App Service automatically injects connection strings defined in the 'Connection strings' blade as environment variables with a specific prefix. For SQL Azure, the prefix is 'SQLAZURECONNSTR_', so the environment variable name becomes 'SQLAZURECONNSTR_MyConn'. Using Environment.GetEnvironmentVariable is the recommended way to retrieve these values at runtime, as they are securely stored and managed by the platform.
What should I do if I get this AZ-204 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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