# Bootstrapping data on startup

This article is a general recommendation for setting up data on startup. This can be useful when bootstrapping a project and setting up Data Types, Definitions, and other entities.

## When to create the data?

We recommend placing the logic for creating data into a HostedService. By inheriting BackgroundService, you create a potentially long-running job activated once at app startup.

{% embed url="<https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services>" %}
Read more about Background tasks on MicrosoftLearn.
{% endembed %}

## Create the Service

{% code overflow="wrap" %}

```csharp
public class SetupData : BackgroundService
{
    private readonly IServiceProvider _serviceProvider;

    public SetupData(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        await using var asyncScope = _serviceProvider.CreateAsyncScope();
        var dbContext = asyncScope.ServiceProvider.GetRequiredService<UcommerceDbContext>();

        // Set up data using dbContext

        await dbContext.SaveChangesAsync(stoppingToken);
    }
}
```

{% endcode %}

## Register the Service

```csharp
builder.Services.AddHostedService<SetupData>();
```

## Related Articles

{% content-ref url="/pages/1yn0Iz3oAJLrBaNc79Dy" %}
[Product Definitions & Fields](/readme/how-to/entities-from-code/product-definitions-and-fields.md)
{% endcontent-ref %}


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