Gets or sets the path to a String value on the source task item to serve as a string representation of the index of the task, or null to indicate that the string representation of the index is not provided by the source task item. The index string is automatically computed based on the position of the task in the task collection and is of this form: 1, 2. This is a dependency property.

[BindableAttribute(true)]
public string IndexStringMemberPath { get; set; }

<BindableAttribute(True)> _
Public Property IndexStringMemberPath As String