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LinqDataSource

This help article describes which properties to use to bind the ASP.NET AJAX Chart to a LinqDataSource and presents a code example. You can bind a RadHtmlChart to a LinqDataSource using the following properties:

  • DataSourceID in the main tag sets the declarative data source for the entire chart. You can use the DataSource property for a programmatic data source if you create the connection in the code-behind.

  • DataFieldY property (and ColorField, ExplodeField, NameField for Pie; DataFieldX for Bubble, Scatter and ScatterLine; etc.) for the series to point it to the desired data source field.

  • DataLabelsField for the x-axis labels to populate the items for the axis.

The data context, used in the following example, is created from the Northwind database:

Example 1: Bind a LinqDataSource to a RadHtmlChart.

ASP.NET
<asp:LinqDataSource ID="LinqDataSource1" runat="server" OnSelecting="LinqDataSource1_Selecting">
</asp:LinqDataSource>
<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" DataSourceID="LinqDataSource1">
	<PlotArea>
		<Series>
			<telerik:ColumnSeries DataFieldY="UnitsInStock" Name="Units">
				<TooltipsAppearance Visible="false" />
			</telerik:ColumnSeries>
		</Series>
		<XAxis DataLabelsField="ProductName">
			<LabelsAppearance />
			<MajorGridLines Visible="false" />
			<MinorGridLines Visible="false" />
		</XAxis>
		<YAxis>
			<TitleAppearance Text="Units" />
			<MinorGridLines Visible="false" />
		</YAxis>
	</PlotArea>
	<Legend>
		<Appearance Visible="false" />
	</Legend>
	<ChartTitle Text="Units In Stock">
	</ChartTitle>
</telerik:RadHtmlChart>

Example 2: Handling the Selecting event of the LinqDataSource from Example 1.

C#
protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
	LinqToSqlReadOnly.NorthwindReadOnlyDataContext northwindContext = new LinqToSqlReadOnly.NorthwindReadOnlyDataContext();
	e.Result = northwindContext.Products.Where(p => p.CategoryID == 1).Take(5);
}

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