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code first migrations with sql server in entity framework

entity framework (ef) code first migrations is a powerful feature that allows you to evolve your database schema over time as your model changes. this tutorial will guide you through the steps to set up and use code first migrations with sql server.

prerequisites

1. **visual studio**: ensure you have visual studio installed (community or higher).
2. **sql server**: you can use sql server express or any other version.
3. **entity framework**: make sure you have the entity framework package installed via nuget.

step 1: create a new project

1. open visual studio.
2. create a new project.
3. choose the "asp.net core web application" template (for .net core) or "asp.net web application" (for .net framework).
4. select "web application" and then click "create".

step 2: install entity framework

to install entity framework, you can use the nuget package manager console or the nuget package manager ui.

*using package manager console:*

1. open the package manager console from `tools - nuget package manager - package manager console`.
2. run the following command to install entity framework:

```bash
install-package entityframework
```

*using nuget package manager ui:*

1. right-click on your project in solution explorer.
2. select "manage nuget packages".
3. search for "entityframework" and install it.

step 3: create your model

define a simple model class. for example, let's create a class representing a `blog`.

```csharp
public class blog
{
public int blogid { get; set; }
public string url { get; set; }
}
```

step 4: set up your dbcontext

create a context class that inherits from `dbcontext`.

```csharp
using system.data.entity;

public class bloggingcontext : dbcontext
{
public bloggingcontext() : base("name=bloggingcontext")
{
}

public dbsetblog blogs { get; set; }
}
```

step 5: configure connection string

add a connection string to your `web.config` ...

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code first migrations
sql server
entity framework
database schema
migration scripts
data annotations
fluent API
update-database
add-migration
rollback migration
seed data
model changes
database initialization
connection string
migration history