mvvm to mssql

PacticeSolution/MSSQL_MVVM_Sample/Structure/Singleton.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MSSQL_MVVM_Sample.Structure
+{
+    public class Singleton<T> where T : class, new()
+    {
+        private static readonly Lazy<T> _instnace = new Lazy<T>(() => new T());
+
+        public delegate void ExceptionEventHandler(string id, Exception ex);
+        
+        public static T Instance { get { return _instnace.Value; } }
+    }
+}