how to change model without losing data in entity framework

Question

please tell me  how to change model in entity framework  without losing data in existing database . when we change model first database deleted and then create new database and i lost existing data.

Ravi Patel · Answer

Hi, I hope you are talking about code first approach once you create database using code first approach then after that if you want to change the model class . that reflect your database if you do not want loose any column value then use migration here is step open your package manager console type the following comand 1. enable-migrations 2. add-migration 3. update-database when ever you change the model class repeat the second and third step   for more details  check this   http://www.c-sharpcorner.com/UploadFile/4b0136/perform-code-first-migration-in-Asp-Net-mvc-5/

Bikesh Srivastava · Answer

I think you are saying about Migration. Visit here:- http://www.dotnet-tricks.com/Tutorial/entityframework/R54K181213-Understanding-Entity-Framework-Code-First-Migrations.html