Make WPF project bootable

Tasks/UrlTester/DT2/DT2.cs

@@ -149,6 +149,7 @@ namespace DT2 {
             LoadSummary("Total", totalSize, (int)sw.Elapsed.TotalMilliseconds);
         }
 
+#if DT2
         public static void Main(string[] args) {
             Console.WriteLine("Starting ...");
             UrlTester urlTester = new UrlTester();
@@ -161,5 +162,6 @@ namespace DT2 {
             Console.Write("Press any key to continue ...\n");
             Console.ReadKey(true);
         }
+#endif
     }
 }

Tasks/UrlTester/UrlTester.csproj

@@ -8,6 +8,10 @@
       <UseWPF>true</UseWPF>
     </PropertyGroup>
 
+    <PropertyGroup>
+      <DefineConstants>$(DefineConstants);DT3</DefineConstants>
+    </PropertyGroup>
+
     <ItemGroup>
       <PackageReference Include="System.ObjectModel" Version="4.3.0" />
     </ItemGroup>