# CosmosDatabaseBuilder Constructors

- Package: [Aspire.Microsoft.Azure.Cosmos](/reference/api/csharp/aspire.microsoft.azure.cosmos.md)
- Type: [CosmosDatabaseBuilder](/reference/api/csharp/aspire.microsoft.azure.cosmos/cosmosdatabasebuilder.md)
- Kind: `Constructors`
- Members: `1`

Represents a builder that can be used to register multiple container instances against the same Cosmos database connection.

## CosmosDatabaseBuilder(IHostApplicationBuilder, string, MicrosoftAzureCosmosSettings, CosmosClientOptions)

- Name: `Constructor(IHostApplicationBuilder, string, MicrosoftAzureCosmosSettings, CosmosClientOptions)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/cbc352350f1a9bafbaff10d14a2c8de4ac186a48/src/Components/Aspire.Microsoft.Azure.Cosmos/CosmosDatabaseBuilder.cs#L14-L18)

Represents a builder that can be used to register multiple container instances against the same Cosmos database connection.

```csharp
public sealed class CosmosDatabaseBuilder
{
    public CosmosDatabaseBuilder(
        IHostApplicationBuilder hostBuilder,
        string connectionName,
        MicrosoftAzureCosmosSettings settings,
        CosmosClientOptions clientOptions)
    {
        // ...
    }
}
```

## Parameters

- `hostBuilder` (`IHostApplicationBuilder`)
- `connectionName` (`string`)
- `settings` ([MicrosoftAzureCosmosSettings](/reference/api/csharp/aspire.microsoft.azure.cosmos/microsoftazurecosmossettings.md))
- `clientOptions` (`CosmosClientOptions`)