# ClientBuilder Constructors

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.hosting.clientbuilder/)

## ClientBuilder(IServiceCollection, IConfiguration) {#constructor-microsoft-extensions-dependencyinjection-iservicecollection-microsof-fe7a2bc4}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.hosting.clientbuilder/constructors/constructor-microsoft-extensions-dependencyinjection-iservicecollection-microsof-fe7a2bc4/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core/Core/ClientBuilder.cs#L17-L22)

```csharp
public ClientBuilder(IServiceCollection services, IConfiguration configuration)
```

Initializes a new instance of the [ClientBuilder](/orleans/docs/api/csharp/microsoft.orleans.core/orleans.hosting.clientbuilder/) class.

### Parameters

- `services` (`IServiceCollection`): The service collection.
- `configuration` (`IConfiguration`)