Add rows Dynamically to gridView

        DataTable dt = new DataTable();
        try
        {

            DataTable dt2 = new DataTable();
            CheckBox chk = new CheckBox();
            foreach (GridViewRow row in gvDept.Rows)
            {
                chk = (CheckBox)row.FindControl("ChkDept");
                if (chk.Checked == true)
                {
                    Label lbl = (Label)row.FindControl("lblcode");
                    string code = lbl.Text;
                    dt = BLSht.GetEmployeeListAsPerDept(code);
                    if (dt.Rows.Count > 0)
                    {
                          foreach(DataRow drr in dt.Rows)
                        {
                         DataRow dr = dt2.NewRow();
                         dr["EmpCode"] = drr["EmpCode"];
                         dr["Name"] = drr["Name"];
                          //if you want to add more columns to dr you can add.
                         dt2.Rows.Add(dr);


                          // DataRow newRow = dt.NewRow();
                         //gvAppEmployees.DataSource = dt;

                        }

                    }
                    else
                    {

                    }
                }
                else
                {

                }
            }
            gvAppEmployees.DataSource = dt2;
            gvAppEmployees.DataBind();
        }
        catch (Exception ex)
        {

        }
    }