initial load

YouTubeViewers.WPF/Commands/AsyncCommandBase.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YouTubeViewers.WPF.Commands
+{
+    public abstract class AsyncCommandBase : CommandBase
+    {
+        private bool _isExecuting;
+
+        public bool IsExecuting
+        {
+            get { return _isExecuting; }
+            set { _isExecuting = value;
+                OnCanExecuteChanged();
+            }
+        }
+
+        public override bool CanExecute(object? parameter)
+        {
+            return !_isExecuting && base.CanExecute(parameter);
+        }
+
+
+        public override async void Execute(object? parameter)
+        {
+            IsExecuting = true;
+
+            try
+            {
+                await ExecuteAsync(parameter);
+            }
+            catch (Exception) { }
+            finally
+            {
+                IsExecuting = false;
+            }
+        }
+
+        public abstract Task ExecuteAsync(object? parameter);
+    }
+}