Ali Hamza Ansari

Implements Quartz.NET scheduling two ways: a console PrintJob firing every 5 seconds via IJob, StdSchedulerFactory, and WithSimpleSchedule().RepeatForever(), then an ASP.NET Core alarm job configured through appsettings.json using the Cron expression 0 0 7 * * ? to run automatically at 7 AM daily. ...

Contrasts C# 9.0 records against classes using a Student(Name, Age) example: records give value-based equality, so two identical Students compare equal, versus classes' reference equality, plus the with expression for non-destructive copies, then argues for records as concise, immutable API DTOs. ...

Walks through .NET 9's JsonSchemaExporter in System.Text.Json: calling GetJsonSchemaAsNode on a Student record to produce a JSON Schema document, then customizing output via JsonSerializerOptions with SnakeCaseLower naming, NumberHandling.WriteAsString, and JsonUnmappedMemberHandling.Disallow. ...

Shows .NET 9's two new LINQ methods replacing GroupBy chains on a Student(Name, Subject) list: CountBy collapses GroupBy().Select(Count) into one call, producing Java: 2, C#: 3, JavaScript: 1, while AggregateBy replaces GroupBy().Sum() to total each subject's Marks in a single seeded aggregation. ...

Demonstrates five C# 11 features with runnable examples: triple-quoted raw string literals for unescaped quotes, list pattern matching like values is [10, 20, 30, ..], UTF-8 string literals via the u8 suffix, required members enforcing FirstName and Email at object initialization, and generic math. ...

Covers two .NET 9 cryptography additions: CryptographicOperations.HashData for one-shot hashing by naming an algorithm like SHA256, and the new KMAC classes (Kmac128, Kmac256, KmacXof128/256) for message authentication, with a Kmac128.HashData example and its Linux OpenSSL 3.0/Win11 requirements. ...

Presents five ASP.NET Core extension-method patterns: an IServiceCollection.InjectedServices method that consolidates dozens of DI registrations out of Program.cs, a string.IsValidEmail() validator built on MailAddress, and a ClaimsPrincipal.IsOneOf(params string[] roles) helper for role checks. ...

Compares three EF Core transaction techniques on a Building entity: automatic transactions where each SaveChangesAsync call is its own implicit transaction, manual transactions wrapping multiple SaveChangesAsync calls via Database.BeginTransaction, and a strategy using CommitAsync for retries. ...

Walks through implementing in-memory caching in ASP.NET Core with the Microsoft.Extensions.Caching.Memory package, covering IMemoryCache injection, absolute and sliding expiration settings, and a CustomerRepository example tested with a debugger. ...