Binding ObjectDataSource Component to a DataTable

The following example illustrates how to use a DataTable as the source for an ObjectDataSource component. The code below additionally creates a calculated field that can be used in the report definition in the same way as a regular field. The example demonstrates also how to configure the report to use the ObjectDataSource and how to preview it in the Windows Forms Report Viewer with code.

The ObjectDataSource component may be configured in the Telerik Report Designers without the need for writing additional code. It may be necessary to extend the Reporting engine to recognize the custom assembly with the data providing logic through the assemblyReferences Element in the Telerik.Reporting section of the designer's configuration file.

• C#
• VB.NET

void Form2_Load(object sender, EventArgs e)
{
    // Creating and configuring the ObjectDataSource component:
    var objectDataSource = new Telerik.Reporting.ObjectDataSource();
    objectDataSource.DataSource = GetData(); // GetData returns a DataTable
    objectDataSource.CalculatedFields.Add(new Telerik.Reporting.CalculatedField("FullName", typeof(string), "=Fields.Name + ' ' + Fields.ProductNumber")); // Adding a sample calculated field.

    // Creating a new report
    var report = new Report1();

    // Assigning the ObjectDataSource component to the DataSource property of the report.
    report.DataSource = objectDataSource;

    // Use the InstanceReportSource to pass the report to the viewer for displaying
    var reportSource = new Telerik.Reporting.InstanceReportSource();
    reportSource.ReportDocument = report;

    // Assigning the report to the report viewer.
    reportViewer1.ReportSource = reportSource;

    // Calling the RefreshReport method in case this is a WinForms application.
    reportViewer1.RefreshReport();
}

static DataTable GetData()
{
    const string connectionString =
        "Data Source=(local)\\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True";

    string selectCommandText =
        "SELECT Name, ProductNumber FROM Production.Product;";

    SqlDataAdapter dataAdapter = new SqlDataAdapter(selectCommandText, connectionString);
    DataTable dataTable = new DataTable();

    dataAdapter.Fill(dataTable);

    return dataTable;
}

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)

    ' Creating and configuring the ObjectDataSource component:
    Dim objectDataSource As New Telerik.Reporting.ObjectDataSource()
    objectDataSource.DataSource = GetData() ' GetData returns a DataTable
    objectDataSource.CalculatedFields.Add(New Telerik.Reporting.CalculatedField("FullName", GetType(String), "=Fields.Name + ' ' + Fields.ProductNumber")) ' Adding a sample calculated field.


    'Creating a new report
    Dim report As New Report1()

    ' Assigning the ObjectDataSource component to the DataSource property of the report.
    report.DataSource = objectDataSource

    ' Use the InstanceReportSource to pass the report to the viewer for displaying.
    Dim reportSource As New InstanceReportSource
    reportSource.ReportDocument = report

    ' Assigning the report to the report viewer.
    reportViewer1.ReportSource = reportSource

    ' Calling the RefreshReport method in case this is a WinForms application.
    Me.reportViewer1.RefreshReport()

End Sub

Shared Function GetData() As DataTable
    Const connectionString As String =
        "Data Source=(local)\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True"

    Dim selectCommandText As String =
        "SELECT Name, ProductNumber FROM Production.Product;"

    Dim dataAdapter = New SqlDataAdapter(selectCommandText, connectionString)
    Dim dataTable As New DataTable()
    dataAdapter.Fill(dataTable)

    Return dataTable
End Function

To use this code in the Report Designer Tools, the data retrival methods must be built in separate assembly and specifically configured before it can be resolved by the Report Designers - Connecting the ObjectDataSource component to a Data Source