Set StartUp Window or Page WPF

WPF  > Windows > Application > StartupUri

StartupUri gets or sets a UI that is automatically shown when an application starts.

Example

StartUp Window or Page WPF

Open App.xaml file and change StartupUri.

<Application x:Class="DataGrid.App"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="winMain.xaml">
    <Application.Resources>
     </Application.Resources>
</Application>