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How to use Entity Framework Core in a C# console application?
To use EntityFrameworkCore, you need to install EFCore and database provider packages, define the data model and DbContext class, configure the connection through OnConfiguring, use the using statement to perform CRUD operations, and optionally add a migration management database schema.
Jan 13, 2026 am 04:23 AM
How to connect to a SQL Server database in C#? (ADO.NET Tutorial)
To connect to the SQLServer database, you need to use ADO.NET's SqlConnection object and a correctly formatted connection string. The steps include defining the string, creating and opening the connection, handling exceptions safely, and releasing resources.
Jan 13, 2026 am 03:49 AM
How to calculate the difference between two dates in C#?
TocalculatethedifferencebetweentwodatesinC#,subtractDateTimevaluestogetaTimeSpan.UseTimeSpanpropertieslikeDays,TotalDays,Hours,andTotalHoursforstandardintervals.Forhuman-readabledifferenceslikeyearsandmonths,implementcustomlogicsinceTimeSpandoesn'tsu
Jan 12, 2026 am 05:42 AM
How to use the 'using' statement in C#? (IDisposable Explained)
TheusingstatementinC#ensurestimelydisposalofIDisposableobjects,especiallyunmanagedresources,viacompiler-generatedtry-finallyblocks;it’sidealforshort-lived,scopedresourcesbutnotforsharedorreturnedobjects.
Jan 12, 2026 am 12:37 AM
How to generate a GUID in C#? (Unique Identifiers)
UseGuid.NewGuid()togenerateacryptographicallystrong128-bitGUID;formatwithToString("D"/"N"/"B"/"P");parsesafelyviaGuid.TryParse();idealfordistributedDBkeys,sessionIDs,andcaching—butavoidasSQLclusteredindexwithou
Jan 11, 2026 am 06:11 AM
What is Reflection in C#?
ReflectioninC#enablesruntimeinspectionoftypesandmetadata,allowingdynamiccreationofobjects,methodinvocation,andattributeaccessviatheSystem.Reflectionnamespace.Itsupportsscenarioslikepluginarchitecturesandserializationbydiscoveringtypeinformationatrunt
Jan 11, 2026 am 05:09 AM
How to get the current date and time in C#?
Use DateTime.Now to obtain the current local date and time of the system, and DateTime.UtcNow to obtain the UTC time. It supports formatted output through the ToString method.
Jan 10, 2026 am 12:15 AM
How to use Generics in C#? (A Practical Guide)
C# generics support writing flexible, reusable and type-safe code; security is improved by defining generic classes and methods, combined with where constraints (such as class, new(), IComparable, etc.), and built-in generic types such as List and Dictionary are widely used.
Jan 10, 2026 am 12:10 AM
How to add an item to a List in C#? (Simple Example)
In C#, adding elements to List mainly uses Add() (append single, O(1)), AddRange() (batch append, support IEnumerable) and Insert() (specify index insertion, O(n)); the preset Capacity can optimize performance.
Jan 09, 2026 am 02:25 AM
How to iterate through a Dictionary in C#? (Key-Value Pairs)
UseforeachwithKeyValuePairtoefficientlyiteratedictionariesandaccesskeys/values;usedict.Keysordict.Valuesforseparatetraversal;leverageLINQforfiltering/transformation;avoidindex-basedloopsduetolackofguaranteedorder.
Jan 09, 2026 am 02:21 AM
How to convert a DataTable to a List in C#?
The most common and flexible method is to use LINQ combined with reflection to traverse the DataRow for mapping, which requires the attribute name of class T to match the DataTable column name (case is ignored by default); it supports null value safe processing, automatic type conversion and exception skipping.
Jan 08, 2026 am 04:57 AM
How to convert a string to an int in C#? (Best Practices)
Priority should be given to using int.TryParse() to convert a string to int, which is safe, efficient and does not throw exceptions; only use int.Parse() when you are sure that the string format is correct; pay attention to edge cases such as cultural differences, null values, whitespace characters, and overflow.
Jan 08, 2026 am 03:57 AM
How to handle exceptions in C# with try-catch? (Guide)
Usetry-catchtohandleruntimeerrorssafelyinC#:wraponlyriskycodeintry,catchspecificexceptionsfirst,logorrecoverincatch,usefinallyforcleanup(preferusingstatements),andre-throwwiththrow;topreservestacktraces.
Jan 07, 2026 am 02:02 AM
How to create a POST request in C#
Use the HttpClient class to send POST requests efficiently. First create an HttpClient instance, then serialize JSON data or build form content, set the corresponding content type, call the PostAsync method to submit the data, and process the response results.
Jan 07, 2026 am 12:49 AM
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