radzen-blazor/RadzenBlazorDemos/Pages/LineChartMultipleSeries.razor

<RadzenStack class="rz-p-0 rz-p-md-6 rz-p-lg-12">
    <RadzenChart>
        <RadzenLineSeries Data="@northData" CategoryProperty="Month" ValueProperty="Revenue" Title="North">
            <RadzenMarkers MarkerType="MarkerType.Circle" />
        </RadzenLineSeries>
        <RadzenLineSeries Data="@southData" CategoryProperty="Month" ValueProperty="Revenue" Title="South">
            <RadzenMarkers MarkerType="MarkerType.Circle" />
        </RadzenLineSeries>
        <RadzenLineSeries Data="@westData" CategoryProperty="Month" ValueProperty="Revenue" Title="West">
            <RadzenMarkers MarkerType="MarkerType.Circle" />
        </RadzenLineSeries>
        <RadzenLegend Position="LegendPosition.Bottom" />
    </RadzenChart>
</RadzenStack>

@code {
    class DataItem
    {
        public string Month { get; set; }
        public double Revenue { get; set; }
    }

    DataItem[] northData = new DataItem[]
    {
        new DataItem { Month = "Jan", Revenue = 234 },
        new DataItem { Month = "Feb", Revenue = 269 },
        new DataItem { Month = "Mar", Revenue = 233 },
        new DataItem { Month = "Apr", Revenue = 244 },
        new DataItem { Month = "May", Revenue = 214 },
        new DataItem { Month = "Jun", Revenue = 253 },
    };

    DataItem[] southData = new DataItem[]
    {
        new DataItem { Month = "Jan", Revenue = 180 },
        new DataItem { Month = "Feb", Revenue = 205 },
        new DataItem { Month = "Mar", Revenue = 198 },
        new DataItem { Month = "Apr", Revenue = 232 },
        new DataItem { Month = "May", Revenue = 254 },
        new DataItem { Month = "Jun", Revenue = 268 },
    };

    DataItem[] westData = new DataItem[]
    {
        new DataItem { Month = "Jan", Revenue = 145 },
        new DataItem { Month = "Feb", Revenue = 162 },
        new DataItem { Month = "Mar", Revenue = 184 },
        new DataItem { Month = "Apr", Revenue = 176 },
        new DataItem { Month = "May", Revenue = 199 },
        new DataItem { Month = "Jun", Revenue = 221 },
    };
}