Hi Maxime,

The fix here addressed an exception that occurred even before loading the data.

In your case, you can check and reset the PageSize when loading the Data in an empty Grid. The real problem is that PageSize "All" is currently a bit of a hack in our source code, because PageSize is an int, while "All" corresponds to null in the PageSizes collection. We have a feature request to allow initial Grid PageSize All and I voted on your behalf.

    async Task LoadData()
    {
        GridData = Enumerable.Range(1, 30).Select(x => new Product
        {
            Id = x,
            Name = "Product name " + x,
            Price = (decimal)(x * 3.14),
            Released = DateTime.Now.AddMonths(-x).Date,
            Discontinued = x % 5 == 0
        }).ToList();

        if (PageSize == 0)
        {
            PageSize = GridData.Count;
        }
    }

Regards,
Dimo
Progress Telerik