radzen-blazor/RadzenBlazorDemos/Pages/NegativeColumnChartConfig.razor

<RadzenStack class="rz-p-0 rz-p-md-6 rz-p-lg-12">
    <RadzenRow>
        <RadzenColumn Size="12">
            <RadzenChart Animate="true">
                <RadzenColumnSeries FillMode="FillMode.Gradient" Data="@data" CategoryProperty="Month" ValueProperty="Value" Title="Monthly Profit and Loss"
                    FillRange="@fillRange">
                </RadzenColumnSeries>
                <RadzenColumnOptions Radius="0" />
                <RadzenValueAxis>
                    <RadzenGridLines Visible="true" />
                </RadzenValueAxis>
                <RadzenLegend Visible="false" />
            </RadzenChart>
        </RadzenColumn>
    </RadzenRow>
</RadzenStack>

@code {
    class ProfitLossData
    {
        public string Month { get; set; }
        public double Value { get; set; }
    }

    ProfitLossData[] data = new[]
    {
        new ProfitLossData { Month = "Jan", Value = 200 },
        new ProfitLossData { Month = "Feb", Value = -800 },
        new ProfitLossData { Month = "Mar", Value = -1200 },
        new ProfitLossData { Month = "Apr", Value = -2500 },
        new ProfitLossData { Month = "May", Value = -300 },
        new ProfitLossData { Month = "Jun", Value = 600 },
        new ProfitLossData { Month = "Jul", Value = 3800 },
        new ProfitLossData { Month = "Aug", Value = 3200 },
        new ProfitLossData { Month = "Sep", Value = 2800 },
        new ProfitLossData { Month = "Oct", Value = 3500 },
        new ProfitLossData { Month = "Nov", Value = 3000 },
        new ProfitLossData { Month = "Dec", Value = 3600 },
    };

    List<SeriesColorRange> fillRange = new()
    {
        new SeriesColorRange { Min = -10000, Max = 0, Color = "var(--rz-danger)" },
        new SeriesColorRange { Min = 0, Max = 10000, Color = "var(--rz-success)" },
    };
}