<p>
    Choose a row height:
    <TelerikDropDownList Data="@RowHeights"
                         Width="5em"
                         Value="@RowHeight"
                         ValueChanged="@( (int v) => RepaintGrid(v) )" />
</p>

@{
    if (ShowGrid)
    {
        <TelerikGrid @ref="VirtualGrid"
                     Data="@GridData"
                     PageSize="20"
                     RowHeight="@RowHeight"
                     ScrollMode="GridScrollMode.Virtual"
                     Height="420px"
                     Resizable="true"
                     Sortable="true"
                     ShowColumnMenu="true"
                     FilterMode="GridFilterMode.FilterMenu"
                     OnStateInit="@( (GridStateEventArgs<Product> args) => RestoreGridState(args) )">
            <GridColumns>
                <GridColumn Field=@nameof(Product.Name) Title="Product Name" />
                <GridColumn Field=@nameof(Product.Price) Title="Price" />
                <GridColumn Field=@nameof(Product.Quantity) Title="Units In Stock" />
            </GridColumns>
        </TelerikGrid>
    }
}

@code {
    TelerikGrid<Product> VirtualGrid;
    List<Product> GridData { get; set; }
    bool ShowGrid = true;
    GridState<Product> VirtualGridState;
    int RowHeight = 48;
    List<int> RowHeights = new() { 48, 96 };

    async Task RestoreGridState(GridStateEventArgs<Product> args)
    {
        if (VirtualGridState != null)
        {
            args.GridState = VirtualGridState;
        }
    }

    async Task RepaintGrid(int newRowHeight)
    {
        VirtualGridState = VirtualGrid.GetState();
        ShowGrid = false;
        await Task.Delay(1);
        RowHeight = newRowHeight;
        ShowGrid = true;
    }

    protected override void OnInitialized()
    {
        GridData = new List<Product>();
        var rnd = new Random();

        for (int i = 1; i <= 1000; i++)
        {

            GridData.Add(new Product()
            {
                ID = i,
                Name = "Product " + i.ToString(),
                Price = (decimal)rnd.Next(1, 100),
                Quantity = (short)rnd.Next(1, 100)
            });
        }
    }

    public class Product
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public short Quantity { get; set; }
    }
}