# HelmChartVersionAnnotation Constructors

- Package: [Aspire.Hosting.Kubernetes](/reference/api/csharp/aspire.hosting.kubernetes.md)
- Type: [HelmChartVersionAnnotation](/reference/api/csharp/aspire.hosting.kubernetes/helmchartversionannotation.md)
- Kind: `Constructors`
- Members: `1`

An annotation placed on a [KubernetesEnvironmentResource](/reference/api/csharp/aspire.hosting.kubernetes/kubernetesenvironmentresource.md) that specifies the Helm chart version for deployment.

## HelmChartVersionAnnotation(ReferenceExpression)

- Name: `Constructor(ReferenceExpression)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/5bd693ae1897dee5e2ce71c2cc08879c1c7eff51/src/Aspire.Hosting.Kubernetes/Annotations/HelmChartVersionAnnotation.cs#L13-L18)

An annotation placed on a [KubernetesEnvironmentResource](/reference/api/csharp/aspire.hosting.kubernetes/kubernetesenvironmentresource.md) that specifies the Helm chart version for deployment.

```csharp
public sealed class HelmChartVersionAnnotation
{
    public HelmChartVersionAnnotation(
        ReferenceExpression version)
    {
        // ...
    }
}
```

## Parameters

- `version` (`ReferenceExpression`)
  A `ApplicationModel.ReferenceExpression` representing the chart version value.