// 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();