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ExI.Event/MyClass.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExI.Event
+{
+    class MyClass
+    {
+        public event EventHandler<EventArgs>? Complished;
+        
+        public void Calc(int complexity)
+        {
+            Thread.Sleep(complexity);
+            Complished?.Invoke(this, EventArgs.Empty);
+        }
+    }
+}