CmsKit - Convert IsValidMediaFileName extension method to staic method

modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptor.cs

@@ -33,7 +33,7 @@ namespace Volo.CmsKit.MediaDescriptors
 
         public void SetName(string name)
         {
-            if (!name.IsValidMediaFileName())
+            if (!MediaDescriptorCheck.IsValidMediaFileName(name))
             {
                 throw new InvalidMediaDescriptorNameException(name);
             }

modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/Extensions/MediaDescriptorExtensions.cs → modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/MediaDescriptors/MediaDescriptorCheck.cs

@@ -3,9 +3,9 @@ using System.Linq;
 
 namespace Volo.CmsKit.MediaDescriptors.Extensions
 {
-    public static class MediaDescriptorExtensions
+    public static class MediaDescriptorCheck
     {
-        public static bool IsValidMediaFileName(this string name)
+        public static bool IsValidMediaFileName(string name)
         {
             if (string.IsNullOrWhiteSpace(name))
             {