Update WpfGridTest.cs

WpfGridTest.cs

@@ -1,9 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
+using System.Collections.Generic;
 using System.Data;
 using System.Linq;
-using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using Xunit;