dont show crystal report

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C#

VB

CrystalReports

Hi
i write following code for a crystal report but it show empty report. why?

string sqlCon = "User ID=sa;server=mycomputer;INITIAL CATALOG=bank_j;";


string sqlstr = @"select code_fa from dbo.mytable
where code_fa = 17 ";


DataSet ds = new DataSet();
SqlConnection cnn = new SqlConnection(sqlCon);
SqlCommand cmd = new SqlCommand(sqlstr, cnn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds, "ttable");
cnn.Open();


CrystalReport2 rpt = new CrystalReport2();
rpt.SetDataSource(ds);
crystalReportViewer1.ReportSource = rpt;
crystalReportViewer1.Refresh();


Thanks