how to design report

Hi all, im student, actually writing a sqlite database winform applications and i need to generate some reports. Im using crystal reports and vs2008. In my applications i got combobox and after selecting and clicking on a button i want to generate a report with details of selected item from combobox. How to design report (adding and naming textboxes and so) to work with this code?

code in constructor of form

conn = new SQLiteConnection(@"data source=db.s3db");
conn.Open();
string select = "select idpod, menopriezvisko||', '||obec as meno from podielnici";
data = new SQLiteDataAdapter(select, conn);
data.Fill(dataSet1);
comboBox1.DataSource = dataSet1.Tables[0];
comboBox1.DisplayMember = "meno";
comboBox1.ValueMember = "idpod";

code in onclick button event

string id = comboBox1.SelectedValue.ToString();
DataTable tab = new DataTable("table");

tring select = "select idpod, menopriezvisko, ulica, obec, PSC, narodenie from podielnici where idpod='" + id + "'";
conn = new SQLiteConnection(@"data source=db.s3db");

data = new SQLiteDataAdapter(select, conn);
data.Fill(tab);            

Form1 frm = new Form1(tab);
           
frm.ShowDialog();
this.Close();

and constructor of form with crystal report viewer

CrystalReport1 rprt = new CrystalReport1();
string file = @"MySchema.xml";
DataSet ds = new DataSet();
ds.Tables.Add(tab);
ds.WriteXmlSchema(file);
rprt.Load(file,CrystalDecisions.Shared.OpenReportMethod.OpenReportByTempCopy);
rprt.SetDataSource(tab);    *
crystalReportViewer1.ReportSource = rprt;

can you pls help me with this problem? i always get error "The report has no tables." at line with asterix