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ExI.Event/Program.cs

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+// See https://aka.ms/new-console-template for more information
+using ExI.Event;
+
+var mycls = new MyClass();
+mycls.Complished += Mycls_Complished;
+
+void Mycls_Complished(object? sender, EventArgs e)
+{
+    Console.WriteLine("작업끝");
+}
+
+mycls.Calc(2000);