// Using DataDirectory macro (ASP.NET) "Server=(localdb)\MSSQLLocalDB;Integrated Security=true;AttachDbFileName=|DataDirectory|AppData.mdf;" using Microsoft.Data.SqlClient; string connString = @"Server=(localdb)\MSSQLLocalDB;Integrated Security=true;"; using var conn = new SqlConnection(connString); conn.Open();
sqllocaldb info MSSQLLocalDB
// Create table cmd.CommandText = "CREATE TABLE Users (Id INT PRIMARY KEY, Name NVARCHAR(100))"; cmd.ExecuteNonQuery(); // In DbContext OnConfiguring or Startup.cs optionsBuilder.UseSqlServer(@"Server=(localdb)\MSSQLLocalDB;Database=MyAppDb;Integrated Security=true;"); 5. Limitations & Workarounds | Limitation | Workaround | |------------|-------------| | Max 10 GB per database | Use multiple databases or migrate to SQL Server Express / Standard | | No SQL Server Agent | Use Task Scheduler or background service for scheduled jobs | | No TCP/IP (named pipes only) | Cannot connect from another machine; use full Express for remote | | Single user process per MDF | Design for exclusive file access; use connection pooling | | Memory limited to user process | Monitor with sqllocaldb ; restart instance if needed | 6. Debugging & Management Tips View current instances: sql server express localdb
sqllocaldb stop MSSQLLocalDB sqllocaldb delete MSSQLLocalDB sqllocaldb create MSSQLLocalDB SQL Server Express LocalDB is the ideal development and testing database for Windows-based .NET applications. It offers the full power of SQL Server without service installation overhead. However, it should never be used in production due to concurrency and resource limitations. // Using DataDirectory macro (ASP