Fix adding chart data label and chart dataset data

Author: MS

blazorbootstrap/Components/Charts/LineChart.razor.cs

@@ -25,9 +25,13 @@ public override async Task<ChartData> AddDataAsync(ChartData chartData, string d
             throw new ArgumentNullException(nameof(data));
 
         foreach (var dataset in chartData.Datasets)
-            if (dataset is LineChartDataset lineChartDataset && lineChartDataset.Label == dataLabel)
-                if (data is LineChartDatasetData lineChartDatasetData)
+            if (data is LineChartDatasetData lineChartDatasetData)
+                if (dataset is LineChartDataset lineChartDataset && lineChartDataset.Label == lineChartDatasetData.DatasetLabel)
+                {
+                    chartData.Labels?.Add(dataLabel);
                     lineChartDataset.Data?.Add(lineChartDatasetData.Data as double?);
+                }
+
 
         await JSRuntime.InvokeVoidAsync("window.blazorChart.line.addDatasetData", Id, dataLabel, data);