Strange behaviour from OpenTK

Question

So I had some code that temporarily ran, I'm just trying to create the most basic hello window in C# OpenTK but what happens is I've created something that is meant to close when i press escape but it has only worked once . From now it doesn't work whenever I run the code the window opens and then closes immediately, I can't see why this shouldn't work.

using OpenTK.Windowing.Common;
using OpenTK.Windowing.Desktop;
using OpenTK.Windowing.GraphicsLibraryFramework;


class Program{
    public static void Main(){
        // Window declaration

        var gw = new GameWindow(GameWindowSettings.Default, NativeWindowSettings.Default);
        


        gw.UpdateFrame += delegate(FrameEventArgs eventArgs)
        {
            
            var input = gw.KeyboardState;

            if (input.IsKeyDown(Keys.Escape)) gw.Close();
        };

        // Running the application
            
        gw.Run();
    }
}