Pass pre populated values to SQL Server database table (using Blazor) - forms

Question

I'm trying to make a booking function, where there are a set of buttons to click depending on for how long you want to book a room; 15 min, 30 min, 60 min.
I need the function to send a set of data items (like AppointmentStart, AppointmentEnd, RoomId etc.) to the data table upon a button click. I've tried to figure hidden fields out but getting nowhere.
The code for one of the buttons (which isn't working because I can't choose what to populate the fields with as I can't have both the #bind and a value="x"):
#if (#schedule.AppointmentDateStart >= ChooseTimeSlot.AddMinutes(15))
{
<div class="col">
<EditForm class="" Model="#schedule" OnValidSubmit="#ValidSubmit">
<button class="btn btn-primary form-control">15 min</button>
<input type="hidden" #bind="#schedule.Room.Id" class="form-control" />
<input type="hidden" #bind="#schedule.AppointmentHeading" class="form-control" />
<input type="hidden" #bind="#schedule.AppointmentDateStart" class="form-control" />
<input type="hidden" #bind="#schedule.AppointmentDateEnd" class="form-control" />
<input type="hidden" #bind="#schedule.BookerId" class="form-control" />
</EditForm>
</div>
}

Answer 1

#onclick=#( () => AppointmentChosen(15) )
from #MistMagoo got me back on track, so this is the solution:
<div class="col"><button class="btn btn-primary form-control" #onclick=#(() => TimeSlot(15, TRoomId))>15 min</button></div>
#code{
[Parameter] public int TRoomId { get; set; }
newSchedule = new Schedule();
{
var SlotAdd = RoundUp(DateTime.Now, TimeSpan.FromMinutes(NextTimeSlot));
newSchedule.RoomId = roomId;
newSchedule.AppointmentHeading = "Snabb";
newSchedule.AppointmentDateStart = DateTime.Now;
newSchedule.AppointmentDateEnd = SlotAdd;
newSchedule.BookerId = 1007;
newSchedule.IsConfirmed = true;
}
}