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ObjectDataSource

This example shows how an ASP.NET AJAX Chart can be bound to an ObjectDataSource. The ObjectDataSource uses a custom class Vehicle, which is declared in the App_Code directory of the website application. The major chart properties are:

  • DataSourceID in the main tag sets the declarative data source for the entire chart. The DataSource property can be used for a programmatic data source if you create the connection in the code-behind.
  • DataFieldY for the series to point it to the desired column of the data source.
  • DataLabelsField for the x-axis labels to populate the items for the axis (it can also be applied to the y-axis).
  • DefaultVB.aspx
  • Vehicle.vb
<%@ Page Language="vb"  %>

<%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head runat="server">
    <title>Telerik ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
    <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />
    <div class="demo-container size-wide">
        <telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Height="400px" Width="800px"
            DataSourceID="ObjectDataSource1">
            <PlotArea>
                <Series>
                    <telerik:ColumnSeries DataFieldY="AverageRating">
                        <TooltipsAppearance Color="White" />
                    </telerik:ColumnSeries>
                </Series>
                <XAxis DataLabelsField="VehicleName">
                    <TitleAppearance Text="Vehicle Name">
                        <TextStyle Margin="20" />
                    </TitleAppearance>
                    <MajorGridLines Visible="false" />
                    <MinorGridLines Visible="false" />
                </XAxis>
                <YAxis>
                    <TitleAppearance Text="Average Rating">
                        <TextStyle Margin="20" />
                    </TitleAppearance>
                    <MinorGridLines Visible="false" />
                </YAxis>
            </PlotArea>
            <ChartTitle Text="Vehicles Average Rating">
            </ChartTitle>
        </telerik:RadHtmlChart>
        <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="Vehicle" SelectMethod="GetVehicleRatings"></asp:ObjectDataSource>
    </div>
    </form>
</body>
</html>

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