How do I suppress the UI rendering in Blazor?

Override the ShouldRender method  to suppress UI rendering. If the implementation returns true, the UI is refreshed. Initial rendering cannot be prevented using this method.

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
 
@code {
    private int currentCount = 0;
    private bool shouldRender = true;
 
    private void IncrementCount()
    {
        shouldRender = false;
        currentCount++;
    }
 
    protected override bool ShouldRender()
    {
        return shouldRender;
    }
}

More information about suppressing UI rendering can be found here.