C# - Tier Separation - How to use these delegates? -

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here's relevant code:

clickmegame.cs

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks;  namespace classlibrary {     public class clickmegame {     public onclickme onclickmecallback;      public int score;      public clickmegame()     {         score = 0;     }      private void incrementscore()     {         score++;     } } }

clickmecallbackdefinitions.cs

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks;  namespace classlibrary {     public delegate void onclickme(); }

mainwindow.cs (windows form)

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using classlibrary;  namespace clickme {     public partial class mainwindow : form {     private clickmegame game;      public mainwindow()     {         initializecomponent();          game = new clickmegame();         game.onclickmecallback = clickmebutton_click();      }      private void clickmebutton_click(object sender, eventargs e)     {         updateui();      }      private void updateui()     {         scorelabel.text = string.format("the score is: {0}", game.score);     } } }

so i'm trying is, when user clicks button present on form, want label on form update game score increments every click.

i'm learning about/want able delegates in want separate project 2 tiers; presenation , logic. know it's unnecessary so, i'd make such when click button, windows form receives information game score via delegates/callback methods. i'm unsure how this, tried making callback definition , referencing it, i'm lost there.

assuming ui button uses click event clickmebutton_click here go. 

public partial class mainwindow : form {     private clickmegame game;      public mainwindow()     {         initializecomponent();          game = new clickmegame();         game.onclickmecallback = param => updateui();      }      private void clickmebutton_click(object sender, eventargs e)     {         game.onclickmecallback.invoke();      }      private void updateui()     {         scorelabel.text = string.format("the score is: {0}", game.score);     } }

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