deprived-main-website/OpenBirchWebsite/Pages/Counter.razor

@page "/counter"
@using System.Runtime.InteropServices

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<p role="status">Current count: @currentCount</p>

<MudButton Color="Color.Primary" Variant=" Variant.Filled" OnClick="test">Click me</MudButton>

@code {
    private int currentCount = 0;
    [DllImport("counter")]
    static extern int fact(int n);

    public void test() {
        currentCount = fact(10);
    }
}