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ObjectDataSource

This help article describes which properties to use to bind a RadHtmlChart to an ObjectDataSource and presents a code example. You can bind a RadHtmlChart to an ObjectDataSource 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 Scatter and ScatterLine, etc.) for the series to point it to the desired field from the data source.

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

Example 1: Bind an ObjectDataSource to a RadHtmlChart.

<telerik:RadHtmlChart runat="server" ID="RadHtmlChart3" Height="400px" Width="800px" DataSourceID="ObjectDataSource1">
    <PlotArea>
        <Series>
            <telerik:ColumnSeries DataFieldY="AverageRating">
            </telerik:ColumnSeries>
        </Series>
        <XAxis DataLabelsField="VehicleName">
            <TitleAppearance Text="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>

The class Vehicle is declared in the directory App_Code of the website and exposes a method, GetVehicleRatings, which returns the data for the chart, as shown in Example 2.

Example 2: Create a class with a static method that returns a DataTable filled with data from a database.

public class Vehicle
{
    private static string connectionString = ConfigurationManager.ConnectionStrings["TelerikConnectionString"].ToString();

    public static DataTable GetVehicleRatings()
    {
        SqlConnection connection = new SqlConnection(connectionString);
        SqlCommand command = new SqlCommand("SELECT TOP 10 [VehicleName], [AverageRating] FROM [Vehicles]", connection);
        SqlDataAdapter adapter = new SqlDataAdapter(command);
        DataSet ds = new DataSet("Vehicles");
        adapter.Fill(ds, "Vehicles");
        return ds.Tables["Vehicles"];
    }

}
Public Class Vehicle
    Private Shared connectionString As String = ConfigurationManager.ConnectionStrings("TelerikConnectionString").ToString()

    Public Shared Function GetVehicleRatings() As DataTable
        Dim connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand("SELECT TOP 10 [VehicleName], [AverageRating] FROM [Vehicles]", connection)
        Dim adapter As New SqlDataAdapter(command)
        Dim ds As New DataSet("Vehicles")
        adapter.Fill(ds, "Vehicles")
        Return ds.Tables("Vehicles")
    End Function
End Class

See Also