How to close a page.xaml

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WPF

C#6.0

in my project i am using the page control that is
something like that

<page x:class="HBS.UI.Masters.Add.AddCategory" 
="" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:ignorable="d" d:designwidth="300" title="ab">
<grid>

how to close this type of xaml page in wpf

What I have tried:

how to close the page.xaml. i tried to close that by using .close or .stop but both are not supporting in this close so how can close that one page.xaml