Blazor and RowNumber in Grid

The data that comes from the backend does not,usually,provide a row number . So how to obtain this ? Create a class,will say any programmer …

public  record DataWithNumber<T>(int number,T data) 
    where T: class
{
}

And the usage

 var data = HttpClient_WebApi.GetFromJsonAsAsyncEnumerable<Order_Details_Extended>(url);
 ArgumentNullException.ThrowIfNull(data);
 int i = 0;

 await foreach (var item in data)
 {
     if (item == null) continue;
     i++;
     dataArr.Add(new DataWithNumber<Order_Details_Extended>(i,item));
     if ((i < 500 && i % 100 == 0) || (i > 500 && i % 1000 == 0))
     {
         Console.WriteLine($"i={i}");
         nrRecordsLoaded = i;

         await InvokeAsync(StateHasChanged);
         await Task.Delay(1000);
     }
 }
 nrRecordsLoaded = i;

And the grid:

<FluentDataGrid Items="@dataForQuery" Virtualize="true" GenerateHeader="GenerateHeaderOption.Sticky">
    <PropertyColumn Property="@(p => p.number)" Sortable="true" />
    <PropertyColumn Property="@(p => p.data.OrderID)" Sortable="true">
        <ColumnOptions>
            <div class="search-box">
                <FluentSearch type="search" Autofocus=true @bind-Value=nameOrderIdFilter @oninput="HandleOrderIdFilter" @bind-Value:after="HandleClearIdFilter" Placeholder="Order Id..." />
            </div>
        </ColumnOptions>
    </PropertyColumn>
    
    <PropertyColumn Property="@(p => p.data.UnitPrice)" Sortable="true" />
    <PropertyColumn Property="@(p => p.data.ExtendedPrice)" Sortable="true" />
    <PropertyColumn Property="@(p => p.data.ProductID)" Sortable="true" />
    <PropertyColumn Property="@(p => p.data.Quantity)" Sortable="true" />
    <PropertyColumn Property="@(p => p.data.Discount)" Sortable="true" />
</FluentDataGrid>