add datatable value to gridview row by row problem

DataTable bindclassattendance = inter.getstudentattendresult(comp);
           if (bindclassattendance.Rows.Count>0 )
           {

               TemplateField amtemp = new TemplateField();
               amtemp.ShowHeader = true;
               amtemp.HeaderText = "AM";
               amtemp.ItemTemplate = new gridviewtemplate(DataControlRowType.DataRow, "AM", "AM", "CheckBox");
               Classattendancegrid.Columns.Add(amtemp);

               TemplateField pmtemp = new TemplateField();
               pmtemp.ShowHeader = true;
               pmtemp.HeaderText = "PM";
               pmtemp.ItemTemplate = new gridviewtemplate(DataControlRowType.DataRow, "PM", "PM", "CheckBox");
               Classattendancegrid.Columns.Add(pmtemp);




               //Classattendancegrid.DataSource = bindclassattendance;
               //  Classattendancegrid.DataBind();
               for (int i = 0; i < bindclassattendance.Rows.Count; i++)
               {

                   Classattendancegrid.Rows[i].Cells[0].Text = bindclassattendance.Rows[i]["AdmissionNumber"].ToString();
                   Classattendancegrid.Rows[i].Cells[1].Text = bindclassattendance.Rows[i]["RollNumber"].ToString();
                   Classattendancegrid.Rows[i].Cells[2].Text = bindclassattendance.Rows[i]["Name"].ToString();
                   bool check1 = Convert.ToBoolean(bindclassattendance.Rows[i]["AM"].ToString());
                   if (check1)
                   {
                       CheckBox chk = Classattendancegrid.Rows[i].FindControl("AM") as CheckBox;
                       chk.Checked = true;

                   }
                   else
                   {
                       CheckBox chk = Classattendancegrid.Rows[i].FindControl("AM") as CheckBox;
                       chk.Checked = false;

                   }
                   bool check2 = Convert.ToBoolean(bindclassattendance.Rows[i]["PM"].ToString());
                   if (check2)
                   {
                       CheckBox chk = Classattendancegrid.Rows[i].FindControl("PM") as CheckBox;
                       chk.Checked = true;

                   }
                   else
                   {
                       CheckBox chk = Classattendancegrid.Rows[i].FindControl("PM") as CheckBox;
                       chk.Checked = false;

                   }

               }