How can I load a dialog on demand?

To load a dialog on demand in Blazor, we can create a modal dialog with a conditional attribute (@if). We can load the dialog in the HTML page by using the conditional attribute, which will render based on the Boolean property.
In the following code, we render the dialog on a button-click event in which the ShowPopup property will be set as true and the dialog will be shown on the page. We can remove the dialog by setting the ShowPopup property as false.

[index.razor]

@page "/"

@using BlazorApp.Data
@inject WeatherForecastService ForecastService

<h3>Dialog</h3>
<button class="btn btn-primary"
        @onclick="OpenDialog">
    Open Dialog
</button>
@if (ShowPopup)
{
    <!-- This is the popup to create or edit a forecast -->
    <div class="modal" tabindex="-1" style="display:block" role="dialog">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h3 class="modal-title">Modal Dialog</h3>
                    <!-- Button to close the popup -->
                    <button type="button" class="close"
                            @onclick="ClosePopup">
                        <span aria-hidden="true">X</span>
                    </button>
                </div>
                <!-- Edit form for the current forecast -->
                <div class="modal-body">
                    <input class="form-control" type="text"
                           placeholder="Celsius forecast"
                           @bind="forecasts[0].TemperatureC" />
                    <input class="form-control" type="text"
                           placeholder="Summary"
                           @bind="forecasts[0].Summary" />
                    <br />
                    <!-- Button to save the forecast -->
                    <button class="btn btn-primary"
                            @onclick="Save">
                        Save
                    </button>
                </div>
            </div>
        </div>
    </div>
}
@code {

    private WeatherForecast[] forecasts;

    protected override async Task OnInitializedAsync()
    {

        forecasts = await ForecastService.GetForecastAsync(DateTime.Now);
    }
    bool ShowPopup = false;
    void OpenDialog()
    {
        // Open the Popup
        ShowPopup = true;
    }
    void ClosePopup()
    {
        // closes the Popup
        ShowPopup = false;
    }
    void Save()
    {
        //closes dialog after the save execution
        ShowPopup = false;
    }
}