This sample creates a data flow package with an OLEDB Source that feeds into a Row Count transform. The Row Count transform is configured to store the result in the RowCountVar package variable.

static void Main(string[] args)
{
    Package package = new Package();

    // Add Data Flow Task
    Executable dataFlowTask = package.Executables.Add("STOCK:PipelineTask");

    // Set the name (otherwise it will be a random GUID value)
    TaskHost taskHost = dataFlowTask as TaskHost;
    taskHost.Name = "Data Flow Task";

    // We need a reference to the InnerObject to add items to the data flow
    MainPipe pipeline = taskHost.InnerObject as MainPipe;

    //
    // Create a package variable to store the row count value
    //

    package.Variables.Add("RowCountVar", false, "User", 0);

    //
    // Add connection manager
    //

    ConnectionManager connection = package.Connections.Add("OLEDB");
    connection.Name = "localhost";
    connection.ConnectionString = "Data Source=localhost;Initial Catalog=AdventureWorksDW2008;Provider=SQLNCLI10.1;Integrated Security=SSPI;Auto Translate=False;";

    //
    // Add OLEDB Source
    //

    IDTSComponentMetaData100 srcComponent = pipeline.ComponentMetaDataCollection.New();
    srcComponent.ComponentClassID = "DTSAdapter.OleDbSource";
    srcComponent.ValidateExternalMetadata = true;
    IDTSDesigntimeComponent100 srcDesignTimeComponent = srcComponent.Instantiate();
    srcDesignTimeComponent.ProvideComponentProperties();
    srcComponent.Name = "OleDb Source";

    // Configure it to read from the given table
    srcDesignTimeComponent.SetComponentProperty("AccessMode", 0);
    srcDesignTimeComponent.SetComponentProperty("OpenRowset", "[DimCustomer]");

    // Set the connection manager
    srcComponent.RuntimeConnectionCollection[0].ConnectionManager = DtsConvert.GetExtendedInterface(connection);
    srcComponent.RuntimeConnectionCollection[0].ConnectionManagerID = connection.ID;

    // Retrieve the column metadata
    srcDesignTimeComponent.AcquireConnections(null);
    srcDesignTimeComponent.ReinitializeMetaData();
    srcDesignTimeComponent.ReleaseConnections();

    //
    // Add Row Count transform
    //

    IDTSComponentMetaData100 rowCount = pipeline.ComponentMetaDataCollection.New();
    rowCount.ComponentClassID = "DTSTransform.RowCount";
    CManagedComponentWrapper instance = rowCount.Instantiate();
    instance.ProvideComponentProperties();

    // Set the variable name property
    instance.SetComponentProperty("VariableName", "User::RowCountVar");

    //
    // Connect the OLEDB Source and the Row Count
    //

    IDTSPath100 path = pipeline.PathCollection.New();
    path.AttachPathAndPropagateNotifications(srcComponent.OutputCollection[0], rowCount.InputCollection[0]);
}