Use a string property to edit decimal value

EditTicket.razor

@page "/EditTicket"

@using System.Globalization

<h3>Edit Ticket # @Ticket.Id</h3>

<EditForm Model="Ticket" OnSubmit="Save">

    <InputText @bind-Value="Ticket.Title" />

    <InputNumber @bind-Value="Ticket.Price" />

    <InputDate @bind-Value="Ticket.Date" />

    <button class="btn btn-primary">Save</button>

    <div class="form-group">
        <label for="Price">Price:</label>
        <InputText id="Price" @bind-Value="PriceAsString" class="form-control" />
    </div>
</EditForm>

@code {

    Ticket Ticket = new Ticket
    {
        Id = Guid.NewGuid(),
        Title = "Fight FCO-SEA",
        Price = 836M,
        Date = DateTime.Now
    };

    string PriceAsString
    {
        get { return Ticket.Price.ToString("#,##0.00", CultureInfo.CurrentCulture); }
        set
        {
            if (Decimal.TryParse(value, NumberStyles.Number,
                CultureInfo.CurrentCulture,out decimal result))
            {
                Ticket.Price = result;
            }
        }
    }

    private void Save()
    {
        // ...
    }
}

A very nitty-gritty solution that don't require a custom validation or component. Not intended for production use, only for demonstrating a concept.