# WithDefaultValue(System.IConvertible)

Method in [DeclarationBuilder](https://docs.yarnspinner.dev/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder)

## Summary

Sets the [DefaultValue](https://docs.yarnspinner.dev/api/csharp/yarn.compiler/yarn.compiler.declaration/yarn.compiler.declaration.defaultvalue) of the [Declaration](https://docs.yarnspinner.dev/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder/yarn.compiler.declarationbuilder.declaration) .

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

## Parameters

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

## Returns

The [DeclarationBuilder](https://docs.yarnspinner.dev/api/csharp/yarn.compiler/yarn.compiler.declarationbuilder) instance that received this method call.