crystal report

string cmd="select name from users ";
DataTable dt = new DataTable();
                DataSet1 ds = new DataSet1();
                 dt= dg1.DataSource as DataTable;
                SqlDataAdapter da = new SqlDataAdapter(cmd, DBConnection.GetSqlConnction());
                da.Fill(ds, "users");
                ds.Tables.Add(dt);
                CrystalReport1 cryst = new CrystalReport1();
                cryst.SetDataSource(ds.Tables);
                crystalReportViewer1.ReportSource = cryst;
                DBConnection.Connectionclose();