ButchersBoy

using System;

namespace BloomFilter
{
    class Program
    {
        static void Main(string[] args)
        {
            AddItem("test");
            AddItem("test2");

ButchersBoy

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.DesignTools.UniversalXamlDesigner.UniversalXamlPlatformMetadata.IsExpression(ITypeId type)
   at Microsoft.VisualStudio.DesignTools.Designer.ViewModel.SceneNode.GetRawComputedValueInternal(PropertyReference propertyReference)
   at Microsoft.VisualStudio.DesignTools.Designer.ViewModel.XamlSceneNode.GetComputedValueInternal(PropertyReference propertyReference)
   at Microsoft.VisualStudio.DesignTools.Designer.ViewModel.XamlSceneNode.GetLiveValueInternal(PropertyReference propertyReference)
   at Microsoft.VisualStudio.DesignTools.Designer.UI.PropertyInspector.SceneNodeObjectSet.GetValue(PropertyReference propertyReference, GetValueFlags getValueFlags)
   at Microsoft.VisualStudio.DesignTools.Designer.UI.PropertyInspector.SceneNodeObjectSet.GetValue(PropertyReference property)
   at Microsoft.VisualStudio.DesignTools.Designer.UI.PropertyInspector.SceneNodeObjectSet.GetValue(PropertyReferenceProperty 

ButchersBoy

<Window x:Class="MaterialDesignColors.WpfExample.PaletteSelectorWindow"
        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:local="clr-namespace:MaterialDesignColors.WpfExample"
        xmlns:wpf="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf"
        xmlns:materialDesignColors="clr-namespace:MaterialDesignColors;assembly=MaterialDesignColors"
        mc:Ignorable="d"
        Title="PaletteSelectorWindow" Height="300" Width="300"

ButchersBoy

<Application x:Class="Application"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                
                <!-- MahApps -->
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />

ButchersBoy

These files are resharper llive templates for working with XAML.  Invaluable if you building custom controls.

ButchersBoy

 public partial class Mah : UserControl
    {
        public Mah()
        {
			DataContext = new MahViewModel();
            InitializeComponent();
        }
    }

	public class MahViewModel