first edit

XLIMS.MVVM/Base/ViewModelBase.cs

@@ -0,0 +1,25 @@
+using System;
+using System.ComponentModel;
+using System.Linq.Expressions;
+using System.Runtime.CompilerServices;
+
+namespace XLIMS.MVVM.Base
+{
+    public abstract class ViewModelBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected void OnPropertyChanged([CallerMemberName] String propertyName="")
+        {
+            PropertyChangedEventHandler handler = PropertyChanged;
+
+            if (handler != null)
+            {
+                handler(this, new PropertyChangedEventArgs(propertyName));
+            }
+        }
+    }
+
+
+
+}