BotPages/Demo/Pages/SubmitPage.cs

using BotPages.Core;
using BotPages.Core.Messaging;

namespace Demo.Pages;

/// <summary>
/// Финальная страница отправки заявки.
/// </summary>
public sealed class SubmitPage : SingletonPage
{
    public override async Task OnEnter(PageContext ctx, CancellationToken ct)
    {
        var progress = new MessageBuilder(ctx);

        var messageId = await progress
            .Text("Отправка заявки\n7%")
            .SendAsync(ct);

        int i = 7;
        do
        {
            i += 25;
            Thread.Sleep(TimeSpan.FromMilliseconds(200));
            await progress
                .Text($"Отправка заявки\n{i}%")
                .EditMessage(messageId!)
                .SendAsync(ct);
        }
        while (i < 100);

        await ctx.Navigation.GoToHomeAsync(ctx, ct);
    }

    public override Task OnLeave(PageContext ctx, CancellationToken ct)
    {
        return new MessageBuilder(ctx).Text("Заявка отправлена").SendAsync(ct);
    }
}