Dim dsCustomers As DSCustomers
Dim oCustomers As New CCustomers()

dsCustomers = oCustomers.GetCustomers()
Dim rds As ReportDataSource = New ReportDataSource
ReportViewer1.LocalReport.DataSources.Clear()
rds.Name = "DSCustomers_OutCustomers"
rds.Value = dsCustomers.OutCustomers
ReportViewer1.LocalReport.DataSources.Add(rds)
ReportViewer1.DataBind()

As a second example, let's say you use a Typed DataSet and TableAdapter as a Data Source and you are creating a WindowsForms application. In the example below, a Typed DataSet has been created called "DataSet1" which queries the Customers table.

Some important things to remember:

• you need to call  the Reset() method on the ReportViewer whenever you dynamically switch reports.
• you need to prefix report (RDLC) filenames with the Namespace of the project the report is in (below the namespace is "ReportViewerTest.")

reportViewer1.Reset();

DataSet1TableAdapters.CustomersTableAdapter ta1 = new DataSet1TableAdapters.CustomersTableAdapter();

DataSet1.CustomersDataTable dt1 = new DataSet1.CustomersDataTable();

ta1.Fill(dt1);

ReportDataSource rds = new ReportDataSource();

reportViewer1.LocalReport.DataSources.Clear();

reportViewer1.LocalReport.ReportEmbeddedResource = "ReportViewerTest.Report1.rdlc";

rds.Name = "DataSet1_Customers";

rds.Value = dt1;

reportViewer1.LocalReport.DataSources.Add(rds);

reportViewer1.RefreshReport();