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How to connect to a SQL Server database with C# and EF Core?
TheminimalSQLServerconnectionstringforEFCorewithWindowsAuthenticationisServer=localhost\\SQLEXPRESS;Database=MyAppDb;Trusted_Connection=true;,andforSQLAuthenticationuseServer=localhost\\SQLEXPRESS;Database=MyAppDb;UserId=myuser;Password=mypass;;regis
Feb 04, 2026 am 01:00 AM
How to securely store and retrieve secrets from Azure Key Vault in C#?
UseDefaultAzureCredentialforsecure,environment-agnosticauthentication—leveragingAzureCLI,managedidentity,orVisualStudioauthwithoutcodechanges;instantiateSecretClientoncewiththefullvaultURI;fetchsecretsasynchronouslywithpropererrorhandlingandRBAC-awar
Feb 04, 2026 am 12:13 AM
How to use Dapper for high-performance data access in C#?
DapperisfasterthanEntityFrameworkforread-heavyworkloadsbecauseitskipsORMoverhead—nochangetracking,runtimequeryplanning,orentitygraphmanagement—andmapsrawSQLresultsdirectlytoPOCOsviafastILgeneration,reducingmemoryallocationsandreflectioncosts.
Feb 03, 2026 am 12:33 AM
How to validate incoming requests in a C# ASP.NET Core API?
Use [ApiController] to enable automatic model validation, which checks ModelState.IsValid before action execution and returns a 400 error; it requires data annotations (such as [Required], [EmailAddress]) and model binding parameters (such as [FromBody]), but it is not suitable for unbound original request bodies or manual verification scenarios.
Feb 03, 2026 am 12:11 AM
What are the new features in C# 12 I should start using now?
C#12 introduces three major practical features: 1. The class/structure main constructor simplifies initialization and supports default immutability; 2. Using aliasable generics and nested types improves readability; 3. Collection expressions [...] support type derivation and expansion, optimizing allocation and performance.
Feb 02, 2026 am 01:19 AM
How to use MediatR to implement the CQRS pattern in C#?
MediatRisalightweightin-processmessaginglibrarythatstructuresCQRSbyseparatinghandlersfromrequestsbutdoesn’tenforceread/writeseparation,persistence,orquery/commandlifetimes.
Feb 02, 2026 am 12:51 AM
How to properly use async and await in C# to avoid deadlocks?
Avoid blocking asynchronous code in C#, such as calling .Result or .Wait(), otherwise it will easily lead to deadlock in the UI or ASP.NET Classic; use await instead and push asynchronous upwards, and always use ConfigureAwait(false) in library code.
Feb 01, 2026 am 01:26 AM
What's the best way to handle exceptions in C# Web API?
UseIExceptionHandlerforasync,centralizederrorhandlingin.NET7 ;registerviaAddExceptionHandler,overrideTryCatchAsync,returnProblemDetails,handlevalidationseparatelyviaInvalidModelStateResponseFactory,andavoidExceptionFilterAttribute.
Feb 01, 2026 am 01:02 AM
C# is vs as operators explained.
Use'is'tochecktypecompatibilityand'as'forsafecastingtoreferencetypes;'is'returnsbool,'as'returnsnullonfailure,andpatternmatching(ifobjistypevar)combinesbothefficiently.
Jan 31, 2026 am 01:00 AM
How to perform a join on two lists using C# LINQ?
Join()performsarelationalinnerjoinbymatchingelementsviakeyselectors,notconcatenation;useZip()forindex-basedpairing.Itrequirestwosequences,matchingkeyselectors,andaresultselector—mismatchedkeyscauseemptyresults,andGroupJoin()enablesleft-joinbehavior.
Jan 31, 2026 am 12:51 AM
How to use IAsyncEnumerable for streaming data in C#?
UseIAsyncEnumerableforasynchronousstreamingwithoutblockingorfullbuffering;ityieldsitemsincrementally,supportsbackpressure,andrequiresWithCancellation()forcancellation—unlikeTaskwhichwaitsforcompletion.
Jan 30, 2026 am 12:51 AM
How to use Polly to add resilience to C# HTTP clients?
PollypolicieswrapHTTPcallexecution,notHttpClientitself,viaPolicyHttpMessageHandlerforautomaticresilienceormanualExecuteAsync()forper-callcontrol;PolicyWraplayerstimeout,retry,andcircuitbreakerwithcorrectinner-to-outerordering.
Jan 30, 2026 am 12:33 AM
How to get the current date and time in C#? (DateTime.Now)
UseDateTime.Nowtogetthelocalsystem’scurrentdateandtime;forUTC,useDateTime.UtcNow;formatwithToString()andculture-awareoptions;cachevaluestoavoidinconsistenciesandpreferDateTimeOffset.Nowforaudittrails.
Jan 29, 2026 am 12:15 AM
How to build a simple REST API from scratch with C#?
You can use HttpListener to build a C# REST API from scratch, but you need to manually handle routing, JSON serialization, status codes, etc.; it only supports Windows natively, and you need to manually parse the request path and method, set the response header and content, and pay attention to stream closing and URL decoding.
Jan 29, 2026 am 12:06 AM
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