Localdb Mssqllocaldb |best| 100%

// Default LocalDB connection string "Server=(localdb)\\MSSQLLocalDB;Database=MyDatabase;Trusted_Connection=true;" // With multiple Active Result Sets (MARS) "Server=(localdb)\MSSQLLocalDB;Database=MyDatabase;Trusted_Connection=true;MultipleActiveResultSets=true;"

public LocalDBRepository(string databaseName) { _connectionString = $@"Server=(localdb)\MSSQLLocalDB;Database={databaseName};Trusted_Connection=true;"; } localdb mssqllocaldb

public static void CreateTables() { string createTablesQuery = @" CREATE TABLE Users ( Id INT PRIMARY KEY IDENTITY(1,1), Username NVARCHAR(50) NOT NULL UNIQUE, Email NVARCHAR(100) NOT NULL, CreatedAt DATETIME2 DEFAULT GETDATE() ); CREATE TABLE Products ( Id INT PRIMARY KEY IDENTITY(1,1), Name NVARCHAR(100) NOT NULL, Price DECIMAL(18,2) NOT NULL, Stock INT DEFAULT 0 );"; using (var connection = new SqlConnection(@"Server=(localdb)\MSSQLLocalDB;Database=MyApp;Trusted_Connection=true;")) { connection.Open(); using (var command = new SqlCommand(createTablesQuery, connection)) { command.ExecuteNonQuery(); Console.WriteLine("Tables created successfully!"); } } } } // appsettings.json { "ConnectionStrings": { "DefaultConnection": "Server=(localdb)\\MSSQLLocalDB;Database=MyAppDb;Trusted_Connection=true;MultipleActiveResultSets=true" } } // DbContext configuration in Program.cs (.NET 6+) using Microsoft.EntityFrameworkCore; Username NVARCHAR(50) NOT NULL UNIQUE

Write-Host "Database '$DatabaseName' created successfully!" -ForegroundColor Green Write-Host "Connection string: Server=(localdb)$InstanceName;Database=$DatabaseName;Trusted_Connection=true;" -ForegroundColor Yellow using Dapper; using System.Data.SqlClient; public class LocalDBRepository { private readonly string _connectionString; Email NVARCHAR(100) NOT NULL

public async Task UpdateUserAsync(User user) { using var connection = new SqlConnection(_connectionString); var sql = "UPDATE Users SET Username = @Username, Email = @Email WHERE Id = @Id"; await connection.ExecuteAsync(sql, user); } }

var builder = WebApplication.CreateBuilder(args);