Added first app template

backend/login-counter/app.Data/LinqExtension.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace app.Data
+{
+    public static class LinqExtension
+    {
+        public static IQueryable<T> OrderByMember<T>(this IQueryable<T> q, string SortField)
+        {
+            var param = Expression.Parameter(typeof(T), "p");
+            var prop = Expression.Property(param, SortField);
+            var exp = Expression.Lambda(prop, param);
+            Type[] types = new Type[] { q.ElementType, exp.Body.Type };
+            var mce = Expression.Call(typeof(Queryable), "OrderBy", types, q.Expression, exp);
+            return q.Provider.CreateQuery<T>(mce);
+        }
+
+        public static IQueryable<T> OrderByMemberDescending<T>(this IQueryable<T> q, string SortField)
+        {
+            var param = Expression.Parameter(typeof(T), "p");
+            var prop = Expression.Property(param, SortField);
+            var exp = Expression.Lambda(prop, param);
+            Type[] types = new Type[] { q.ElementType, exp.Body.Type };
+            var mce = Expression.Call(typeof(Queryable), "OrderByDescending", types, q.Expression, exp);
+            return q.Provider.CreateQuery<T>(mce);
+        }
+
+    }
+}