XtraReport1.DataSource of Devexpress and assign the filed into XtraReport ??

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

        // 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();