> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/2.3/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder/yarn.compiler.declarationbuilder.withdefaultvalue.md).

# WithDefaultValue(System.IConvertible)

Method in [DeclarationBuilder](/2.3/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder.md)

## Summary

Sets the [DefaultValue](/2.3/api/csharp/yarn.compiler/yarn.compiler.declaration/yarn.compiler.declaration.defaultvalue.md) of the [Declaration](/2.3/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder/yarn.compiler.declarationbuilder.declaration.md) .

```csharp
public DeclarationBuilder WithDefaultValue(System.IConvertible defaultValue)
```

## Parameters

| Name                               | Description                                    |
| ---------------------------------- | ---------------------------------------------- |
| `System.IConvertible` defaultValue | The default value to apply to the Declaration. |

## Returns

The [DeclarationBuilder](/2.3/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder.md) instance that received this method call.