> For the complete documentation index, see [llms.txt](https://docs.lithnet.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lithnet.io/ecma2-framework/v2.0/advanced/index/lithnet.ecma2framework.iecmastartup.md).

# IEcmaStartup

Namespace: Lithnet.Ecma2Framework

Defines the methods and properties that a start up class must implement

```csharp
public interface IEcmaStartup
```

## Methods

### **Configure(IConfigurationBuilder)**

This method is called when the ECMA2 framework is initializing. Use this method to configure the configuration builder.

```csharp
void Configure(IConfigurationBuilder builder)
```

#### Parameters

`builder` IConfigurationBuilder\
The configuration builder to configure

### **SetupServices(IServiceCollection, IConfigParameters)**

This method is called when the ECMA2 framework is initializing. Use this method to register your custom services with the DI container.

```csharp
void SetupServices(IServiceCollection services, IConfigParameters configParameters)
```

#### Parameters

`services` IServiceCollection\
A collection of services to add your custom services to

`configParameters` [IConfigParameters](/ecma2-framework/v2.0/advanced/index/lithnet.ecma2framework.iconfigparameters.md)\
The configuration parameters as made available from the Microsoft Identity Management service


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