Add project files.

Library/Base/ObservableRangeCollection.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+
+namespace CMM.Library.Base
+{
+    /// <summary> 
+    /// Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed. 
+    /// </summary> 
+    /// <typeparam name="T"></typeparam> 
+    public class ObservableRangeCollection<T> : ObservableCollection<T>
+    {
+        /// <summary> 
+        /// Adds the elements of the specified collection to the end of the ObservableCollection(Of T). 
+        /// </summary> 
+        public void AddRange(IEnumerable<T> collection)
+        {
+            if (collection == null) throw new ArgumentNullException("collection");
+
+            foreach (var i in collection) Items.Add(i);
+            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        /// <summary> 
+        /// Removes the first occurence of each item in the specified collection from ObservableCollection(Of T). 
+        /// </summary> 
+        public void RemoveRange(IEnumerable<T> collection)
+        {
+            if (collection == null) throw new ArgumentNullException("collection");
+
+            foreach (var i in collection) Items.Remove(i);
+            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        /// <summary> 
+        /// Clears the current collection and replaces it with the specified item. 
+        /// </summary> 
+        public void Replace(T item)
+        {
+            ReplaceRange(new T[] { item });
+        }
+
+        /// <summary> 
+        /// Clears the current collection and replaces it with the specified collection. 
+        /// </summary> 
+        public void ReplaceRange(IEnumerable<T> collection)
+        {
+            if (collection == null) throw new ArgumentNullException("collection");
+
+            Items.Clear();
+            foreach (var i in collection) Items.Add(i);
+            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+        }
+
+        /// <summary> 
+        /// Initializes a new instance of the System.Collections.ObjectModel.ObservableCollection(Of T) class. 
+        /// </summary> 
+        public ObservableRangeCollection()
+            : base() { }
+
+        /// <summary> 
+        /// Initializes a new instance of the System.Collections.ObjectModel.ObservableCollection(Of T) class that contains elements copied from the specified collection. 
+        /// </summary> 
+        /// <param name="collection">collection: The collection from which the elements are copied.</param> 
+        /// <exception cref="System.ArgumentNullException">The collection parameter cannot be null.</exception> 
+        public ObservableRangeCollection(IEnumerable<T> collection)
+            : base(collection) { }
+    }
+}

Library/Base/PropertyBase.cs

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+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace CMM.Library.Base
+{
+    public class PropertyBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        virtual internal protected void OnPropertyChanged(string propertyName)
+        {
+            if (this.PropertyChanged != null)
+            {
+                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+            }
+        }
+
+        protected void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected void SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
+        {
+            if (object.Equals(storage, value)) return;
+
+            storage = value;
+            this.OnPropertyChanged(propertyName);
+        }
+    }
+}