Using 'nameof' operator instead of magic strings

src/MvcMusicStore.Spa/Infrastructure/PagedList.cs

@@ -44,7 +44,7 @@ namespace MvcMusicStore.Infrastructure
         {
             if (query == null)
             {
-                throw new ArgumentNullException("query");
+                throw new ArgumentNullException(nameof(query));
             }
 
             var pagingConfig = new PagingConfig(page, pageSize);
@@ -69,7 +69,7 @@ namespace MvcMusicStore.Infrastructure
         {
             if (query == null)
             {
-                throw new ArgumentNullException("query");
+                throw new ArgumentNullException(nameof(query));
             }
 
             var pagingConfig = new PagingConfig(page, pageSize);

src/MvcMusicStore.Spa/Infrastructure/SortExpression.cs

@@ -37,7 +37,7 @@ namespace MvcMusicStore.Infrastructure
 
             if (source == null)
             {
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             }
 
             if (String.IsNullOrWhiteSpace(sortExpression))