DBML vs EDMX vs Entity Framework vs ADO.NET vs Dapper — Including When to Use What

DBML vs EDMX vs Entity Framework vs ADO.NET vs Dapper — Including When to Use What

🔍 Big Picture (Evolution Timeline)

ADO.NET (2002)

↓

LINQ to SQL (DBML) – 2007

↓

Entity Framework (EDMX) – 2008

↓

Dapper (Micro-ORM) – 2011

↓

EF Core – Modern ORM

1️⃣ DBML (LINQ to SQL)

🔹 What it is

Database-first ORM

Works only with SQL Server

Uses DataContext

Visual Studio generates .dbml

🔹 Key Points

✔ Simple & lightweight

✔ Automatic SQL generation

❌ No longer enhanced

❌ Not supported in .NET Core

🔹 Used in

▪️ Legacy .NET Framework apps

▪️ Old WebForms / MVC / Web API

DataContext db = new DataContext();

db.Employees.ToList();

2️⃣ EDMX (Entity Framework 6)

🔹 What it is

Visual model for Entity Framework

Supports DB-First, Model-First

Uses DbContext

Generates .edmx

🔹 Key Points

✔ Multiple DB support

✔ Rich features (Lazy loading, Navigation)

❌ Heavy & complex

❌ EDMX not used in EF Core

DbContext db = new AppDbContext();

db.Employees.ToList();

3️⃣ Entity Framework (EF / EF Core)

🔹 What it is

Full-fledged ORM

EF Core is modern, fast, cross-platform

Uses DbContext

Code-First / DB-First

🔹 Key Points

✔ Modern & actively developed

✔ Migrations support

✔ Works with SQL, Oracle, MySQL, PostgreSQL

❌ Slower than Dapper in heavy reads

db.Employees.Where(x => x.Salary > 50000);

4️⃣ ADO.NET (Low Level)

🔹 What it is

Raw database access

Manual SQL + connection handling

Uses SqlConnection, SqlCommand

🔹 Key Points

✔ Maximum control

✔ Best performance

❌ Verbose code

❌ Hard to maintain

SqlCommand cmd = new SqlCommand(sql, conn);

5️⃣ Dapper (Micro-ORM)

🔹 What it is

Lightweight ORM on top of ADO.NET

Manual SQL, automatic mapping

Created by StackOverflow

🔹 Key Points

✔ Extremely fast

✔ Minimal abstraction

✔ Ideal for read-heavy systems

❌ No change tracking

❌ No migrations

conn.Query("SELECT * FROM Employees");

🎯 WHEN TO USE WHAT (Real Projects)

✅ Use DBML

▪️ Legacy .NET Framework app

▪️ SQL Server only

▪️ Minimal future changes

✅ Use EDMX (EF6)

▪️ Large legacy EF projects

▪️ Complex relationships

▪️ NET Framework only

✅ Use EF Core

▪️ New development

▪️ Business-heavy logic

▪️ Rapid development

✅ Use Dapper

▪️ High-performance APIs

▪️ Read-heavy dashboards

▪️ Stored procedure systems

✅ Use ADO.NET

▪️ Ultra-critical performance

▪️ Full SQL control

▪️ Database utilities

🔥 COMMON INTERVIEW QUESTION (Answered)

Can we use DBML with DbContext?

❌ No — DBML uses DataContext

Is EDMX supported in EF Core?

❌ No — EF Core uses Code-First / Scaffolding

Fastest among all?

🥇 ADO.NET

🥈 Dapper

🥉 EF Core

📝 SUMMARY

DBML → Legacy LINQ to SQL

EDMX → Old EF visual designer

EF Core → Modern ORM standard

Dapper → High-performance micro ORM

ADO.NET → Raw power & control

— Kulshresth

Full-Stack .NET Developer