assign the filed for XtraReport ?

Question

After you assign the DataSource to the Report, I want to assign to the label, textbox, xrTableCell1,... Report should I do? or I want to DataBinding, currently running it does not appear at all records

[CODE]
// After successful connection Northwind
// Create an empty report. XtraReport1 report = new XtraReport1();
string sql = "select * from Customers";
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(sql, cnn);
da.Fill(ds);
report.DataSource = ds;
report.DataAdapter = da;
report.DataMember = Customers; // Table Customers of Northwind
report.ShowPreview();
[/CODE]