gridview rowdatabound event is not firing?

protected void submitbtn_Click(object sender, EventArgs e)
        {
            classmarkgrid.Columns.Clear();
            comp.ACADAMICYEAR = acyeardropdown.SelectedItem.Text.ToString();
            comp.MEDIUM = mediumdropdown.SelectedItem.Text.ToString();
            string cname = classdropdown.SelectedItem.Text;
            string[] divide = cname.Split('-');
            comp.CLASSNAME = divide[0].ToString();
            comp.SECTIONNAME = Convert.ToChar(divide[1].Trim().ToString());
            comp.EXAMNAMES = examdropdown.SelectedItem.Text;
            DataSet getmark = inter.getclassmark(comp);
            if (getmark.Tables.Count >0)
            {
                if (comp.EXAMNAMES == "Quartely Exam" || comp.EXAMNAMES == "Half yearly exam" || comp.EXAMNAMES == "Annual Exam")
                {
                    DataTable bindtable = inter.bindtablesformarksingrid(getmark);
                    classmarkgrid.DataSource = bindtable;
                }
                else
                {
                    DataTable bindtable1 = inter.bindtablesformarkextergrid(getmark);
                    classmarkgrid.DataSource = bindtable1;
                    
                }
                 
                classmarkgrid.DataBind(); //problem in this databind method. Here row databound event is not fired.

            }
            else
            {
                DataTable studentlist = inter.getstudentlistformark(comp);
                
                DataTable getsubjectforclass = inter.getsubjectlist(comp);

                DataTable gridback =mark.setgrid(studentlist, getsubjectforclass, comp);
                if (comp.EXAMNAMES == "Quartely Exam" || comp.EXAMNAMES == "Half yearly exam" || comp.EXAMNAMES == "Annual Exam")
                {

                    for (int i = 0; i < gridback.Columns.Count; i++)
                    {
                        
                        if (i >= 3)
                        {
                            TemplateField adtmep = new TemplateField();
                            adtmep.ShowHeader = true;
                            adtmep.HeaderText = gridback.Columns[i].ColumnName;
                            adtmep.ItemTemplate = new  gridviewtemplatewithoutbind(DataControlRowType.DataRow, gridback.Columns[i].ColumnName, gridback.Columns[i].ColumnName, "TextBox");
                            classmarkgrid.Columns.Add(adtmep);
                            continue;
                        }
                        TemplateField adtmep1 = new TemplateField();
                        adtmep1.ShowHeader = true;
                        adtmep1.HeaderText = gridback.Columns[i].ColumnName;
                        adtmep1.ItemTemplate = new gridviewtemplate(DataControlRowType.DataRow, gridback.Columns[i].ColumnName, gridback.Columns[i].ColumnName, "Label");
                        classmarkgrid.Columns.Add(adtmep1);


                        
                    }
                }
                else
                {
                    for (int i = 0; i < gridback.Columns.Count; i++)
                    {

                        if (i >= 3)
                        {
                            TemplateField adtmep = new TemplateField();
                            adtmep.ShowHeader = true;
                            adtmep.HeaderText = gridback.Columns[i].ColumnName;
                            adtmep.ItemTemplate = new gridviewtemplatewithoutbind(DataControlRowType.DataRow, gridback.Columns[i].ColumnName, gridback.Columns[i].ColumnName, "TextBox");
                            classmarkgrid.Columns.Add(adtmep);
                            continue;
                        }
                        
                        TemplateField adtmep1 = new TemplateField();
                        adtmep1.ShowHeader = true;
                        adtmep1.HeaderText = gridback.Columns[i].ColumnName;
                        adtmep1.ItemTemplate = new gridviewtemplate(DataControlRowType.DataRow, gridback.Columns[i].ColumnName, gridback.Columns[i].ColumnName, "Label");
                        classmarkgrid.Columns.Add(adtmep1);



                    }
                }
                

                classmarkgrid.DataSource = gridback;
                classmarkgrid.DataBind();// here it is fired
              //  ViewState["bindclassmark"] = gridback;
                
                Savebtn.Visible = true;
                Cancelbtn.Visible = true;
            }
            

        }