How Do I Solve The Error Of "Database Log On Failed " In Printing Crystal Reports Using C# And Sql Server Database Sending To One Note

Connection.openconnection();
            for (int c = 0; c < dataGridView1.Rows.Count - 1; c++)
            {
                SqlDataAdapter da = new SqlDataAdapter("select * from student_details,institution_details where current_class='" + this.dataGridView1.Rows[c].Cells[0].Value + "'", Connection.con);

                DataSet ds = new DataSet();
                da.Fill(ds, "classlist");

                ReportDocument bkng = new ReportDocument();
                bkng.Load(Application.StartupPath + "\\Classlist.rpt");
                bkng.SetDataSource(ds.Tables["classlist"]);
                PrinterSettings print = new PrinterSettings();
                //pass parameters
                //pass year
                string strParameter1 = "";
                strParameter1 = Convert .ToString (this.dataGridView1.Rows[c].Cells[0].Value);
                bkng.SetParameterValue("Class", strParameter1);
                bkng.PrintOptions.PrinterName = print.PrinterName;
               //break point is at this line
                bkng.PrintToPrinter(1, false, 0, 0);
            }
            Connection.closeconnection