use C# 10

Author: lostmsu

source/VirtualDesktop/VirtualDesktop.csproj

@@ -3,12 +3,13 @@
   <PropertyGroup>
     <TargetFrameworks>net46;net6.0-windows10.0.19041.0</TargetFrameworks>
     <Version>0.0.4</Version>
+    <LangVersion>10.0</LangVersion>
     <UseWPF>true</UseWPF>
     <PackageId>LostTech.VirtualDesktop</PackageId>
     <Authors>grabacr.net, Victor Milovanov</Authors>
     <Company>Lost Tech LLC, grabacr.net</Company>
     <Description>C# wrapper for IVirtualDesktopManager on Windows 10. You need to include the app manifest in your project so as to target Windows 10.</Description>
-    <Copyright>© 2020 Lost Tech LLC; © 2015 Manato KAMEYA</Copyright>
+    <Copyright>© 2022 Lost Tech LLC; © 2015 Manato KAMEYA</Copyright>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/losttech/VirtualDesktop</PackageProjectUrl>
     <RepositoryUrl>https://github.com/losttech/VirtualDesktop.git</RepositoryUrl>

source/VirtualDesktop/VirtualDesktop.static.cs

@@ -30,7 +30,7 @@ partial class VirtualDesktop
 		/// Gets a value indicating whether virtual desktop API is present in the system.
 		/// It might still not be supported. See <see cref="IsSupported"/>.
 		/// </summary>
-		public static bool IsPresent => ComObjects.VirtualDesktopManager != null;
+		public static bool IsPresent => ComObjects.VirtualDesktopManager is not null;
 
 		[EditorBrowsable(EditorBrowsableState.Never)]
 		public static Exception InitializationException { get; }