Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
Dependency property identifier field: TextDecorationsProperty
A text decoration is a visual ornament that you can add to text. Windows Phone supports only one type of text decoration: Underline. The type name of type used to set this property (TextDecorationCollection) suggests multiple possible values, but only one value is supported. The TextDecorationCollection object in Windows Phone supports only object. It does support Collection interface APIs or a public constructor.
In XAML, you can set to the value Underline or to an empty string (equivalent to no underline).
In code, you can set the value of to Underline or to null. Setting the value to null effectively restores the default value if it has been set to Underline in XAML or code previously .
settings for Run child elements override this top-level setting.
The following code example shows how you can use the property to underline the text in a TextBlock.