No Record is Displaying in Crystal report. help me with this. ThanX in advance

string query = "SELECT Account_Credit.Transaction_No, Account_Credit.Amount_Credit, Account_Credit.Credit_Date, Account_Credit.Total_Amount_Credit,     Account_Debit.Transaction_No, Account_Debit.Amount_Debit, Account_Debit.Debit_Date, Account_Debit.Total_Amount_Debit, Accounts.Account_No FROM Account_Credit INNER JOIN     Account_Debit ON Account_Credit.Transaction_No = Account_Debit.Transaction_No INNER JOIN Accounts ON Account_Credit.Account_No = Accounts.Account_No and Accounts.Account_No='" + cboaccount1.Text + "-" + cboaccount2.Text + "'";
                   da = new SqlDataAdapter(query, cn);
                   DataTable dt = new DataTable();
                   da.Fill(dt);
                   if (dt.Rows.Count == 0)
                   {
                       MessageBox.Show("The Complete Info of Account No'" + cboaccount1.Text + "-" + cboaccount2.Text + "'does not Exists!!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                       cboaccount1.SelectAll();
                       cboaccount1.Focus();
                   }
                   else
                   {

                  this.Close();
                  CrystalReport1 crt = new CrystalReport1();
                       crt.SetDataSource(dt);
                       Report_Viewer rpt = new Report_Viewer();
                       rpt.Show();
                       rpt.crystalReportViewer1.ReportSource = crt;
                       rpt.crystalReportViewer1.Refresh();
                       dt.Clear();
                       cn.Close();
                   }
               }