Code cleanup and optimizing

GUT.Schedule/GUTSchedule.UWP/Controls/ClearCalendarControl.xaml

@@ -0,0 +1,26 @@
+<ContentDialog
+    x:Class="GUTSchedule.UWP.Controls.ClearCalendarControl"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	xmlns:appointments="using:Windows.ApplicationModel.Appointments"
+	mc:Ignorable="d"
+	x:Uid="clearScheduleTitle"
+	Loaded="ContentDialog_Loaded"
+	Title="Clear schedule calendar"
+	
+	SecondaryButtonText="Cancel"
+	PrimaryButtonText="Clear">
+
+	<StackPanel>
+		<ListView SelectionMode="Multiple" x:Name="targetsList">
+			<ListView.ItemTemplate>
+				<DataTemplate x:DataType="appointments:AppointmentCalendar">
+					<TextBlock Text="{Binding DisplayName}"/>
+				</DataTemplate>
+			</ListView.ItemTemplate>
+		</ListView>
+		<CheckBox x:Uid="clearUpcoming" Content="Remove only upcoming events" x:Name="clearUpcoming"/>
+	</StackPanel>
+</ContentDialog>

GUT.Schedule/GUTSchedule.UWP/Controls/ClearCalendarControl.xaml.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using Windows.UI.Xaml.Controls;
+
+namespace GUTSchedule.UWP.Controls
+{
+	public sealed partial class ClearCalendarControl : ContentDialog
+	{
+		public IEnumerable<object> SelectedCalendars => targetsList.SelectedItems;
+		public bool ClearUpcomingOnly => clearUpcoming.IsChecked.Value;
+
+		public ClearCalendarControl() =>
+			InitializeComponent();
+
+		private async void ContentDialog_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e) =>
+			targetsList.ItemsSource = await Calendar.GetCalendars();
+	}
+}