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πŸ“– Mastering .NET Interviews – Part 8: Azure & Cloud Integration

πŸ“Œ Series Context: This is the eighth article in the 10‑part series covering the most important areas of .NET interview preparation. In Part 1, we introduced the .NET ecosystem. In Part 2, we covered C# fundamentals. In Part 3, we explored advanced C# features. In Part 4, we discussed ASP.NET MVC. In Part 5, we focused on ASP.NET Core. In Part 6, we covered Entity Framework & Data Access. In Part 7, we explored Web API & Microservices. Now, we’ll dive into Azure & Cloud Integration.

Why Azure & Cloud Integration?

Modern .NET applications are often cloud-native. Microsoft Azure provides a rich ecosystem for hosting, scaling, and integrating applications. Interviewers frequently ask about Azure App Services, Functions, Storage, and Cosmos DB.

Key Azure Services for .NET Developers

Azure App Service

  • Host web applications and APIs.

  • Supports automatic scaling.

  • Simplifies deployment and infrastructure management.

Azure Functions

  • Serverless compute platform.

  • Executes event-driven workloads.

  • Automatically scales based on demand.

Azure Storage

Supports multiple storage options:

  • Blob Storage

  • Queue Storage

  • Table Storage

Cosmos DB

  • Globally distributed NoSQL database.

  • Low-latency access worldwide.

  • Supports multiple consistency models.

Azure DevOps

  • CI/CD pipeline automation.

  • Source control integration.

  • Automated testing and deployments.

Hosting a .NET App on Azure

Deploying an ASP.NET Core application to Azure App Service:

dotnet publish -c Release

az webapp up `
    --name HospitalApp `
    --resource-group HospitalRG `
    --runtime "DOTNET|6.0"

πŸ‘‰ Interview Tip: Be ready to explain the difference between Azure App Service and Azure Functions.

Azure Functions Example

Azure Functions are ideal for lightweight, event-driven workloads.

[FunctionName("ProcessInvoice")]
public static async Task<IActionResult> Run(
    [HttpTrigger(
        AuthorizationLevel.Function,
        "post"
    )]
    Invoice invoice,
    ILogger log)
{
    log.LogInformation(
        $"Processing invoice {invoice.Id}"
    );

    return new OkObjectResult(
        $"Invoice {invoice.Id} processed"
    );
}

πŸ‘‰ Serverless functions are commonly used for:

  • Billing processes

  • Notification systems

  • Background jobs

  • Data processing workflows

Cosmos DB Integration

Integrating Cosmos DB with a .NET application:

CosmosClient client =
    new CosmosClient(connectionString);

Database db =
    await client.CreateDatabaseIfNotExistsAsync(
        "HospitalDB"
    );

Container container =
    await db.CreateContainerIfNotExistsAsync(
        "Patients",
        "/id"
    );

πŸ‘‰ Interview Tip: Be prepared to explain:

  • Partition Keys

  • Global Distribution

  • Consistency Levels

  • Throughput (RU/s)

Cloud Deployment Considerations

Scalability

  • Auto-scaling based on workload demand.

  • Horizontal and vertical scaling options.

  • Load balancing support.

Security

  • Role-Based Access Control (RBAC)

  • Managed Identities

  • Azure Key Vault integration

  • Network security controls

Monitoring

Azure provides comprehensive monitoring through:

  • Azure Application Insights

  • Azure Monitor

  • Log Analytics

Cost Optimization

Common strategies include:

  • Pay-as-you-go pricing

  • Reserved Instances

  • Auto-scaling rules

  • Resource optimization

Common Interview Questions (Part 8)

  • What is the difference between Azure App Service and Azure Functions?

  • How do you integrate Cosmos DB with .NET applications?

  • Explain scalability and monitoring in Azure.

  • What are Managed Identities in Azure?

  • How do you set up CI/CD pipelines with Azure DevOps?

Conclusion

In this eighth part, we covered:

  • Key Azure services for .NET developers.

  • Hosting applications using Azure App Service.

  • Event-driven computing with Azure Functions.

  • NoSQL integration using Cosmos DB.

  • Cloud deployment considerations such as scalability, security, monitoring, and cost optimization.

This foundation prepares you for Part 9, where we'll explore Testing & Performanceβ€”covering unit testing, mocking, and performance tuning in .NET.

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