submit Add and Edit Command

Apollon.WPF/Commands/AsyncCommandBase.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Apollon.WPF.Commands
+{
+    public abstract class AsyncCommandBase : CommandBase
+    {
+        public override async void Execute(object parameter)
+        {
+            try
+            {
+                await ExecuteAsync(parameter);
+            }
+            catch (Exception) { }
+                        
+        }
+
+        public abstract Task ExecuteAsync(object parameter);
+    }    
+}