# ReferenceExpressionBuilder Properties

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [ReferenceExpressionBuilder](/reference/api/csharp/aspire.hosting/referenceexpressionbuilder.md)
- Kind: `Properties`
- Members: `1`

A builder for creating [ReferenceExpression](/reference/api/csharp/aspire.hosting/referenceexpression.md) instances.

## IsEmpty

- Name: `IsEmpty`
- Modifiers: `get`
- Returns: `bool`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.Hosting/ApplicationModel/ReferenceExpression.cs#L496)

Indicates whether the expression is empty.

```csharp
public bool IsEmpty { get; }
```