asp.net c# event handler not working second time -


i have asp.net web page contain panel filled on run time

protected void page_load(object sender, eventargs e) {      buildstructure(1); }

and method

public void buildstructure(int level_id) {      pmain.controls.clear();     //response.write(@"<script language='javascript'>alert('" + level_id + "');</script>");      datautility du = new datautility(@"****");     datatable dt = du.getdatatable("select * dbo.prstructure_main level_id = "+level_id);     int curr_level = 1;     int curr_child = 1;     int totalchild = 0;     if (dt.rows.count > 0)     {         panel plevel = new panel();         plevel.cssclass = "level";          panel pitem = new panel();         pitem.cssclass = "item-ceo";          label litem = new label();         litem.text = dt.rows[0].itemarray[2].tostring();          pitem.controls.add(litem);         plevel.controls.add(pitem);         pmain.controls.add(plevel);           panel plevelline = new panel();         plevelline.cssclass = "level";          panel pitemline = new panel();         pitemline.cssclass = "item-line-ceo";          panel pline = new panel();         pline.cssclass = "horizontal-line";          pitemline.controls.add(pline);         plevelline.controls.add(pitemline);         pmain.controls.add(plevelline);          panel plevelline2 = new panel();         plevelline2.cssclass = "level";          panel plevel2 = new panel();         plevel2.cssclass = "level";          dt = du.getdatatable("select * dbo.prstructure_main level_parent = "+(convert.toint32( dt.rows[0].itemarray[0].tostring())));         lbitem2 = new linkbutton[dt.rows.count];         (int = 0; < dt.rows.count; i++)         {             panel pitemline2 = new panel();             panel pline2 = new panel();             if (i == 0)             {                 pitemline2.cssclass = "item-line-level2-first";                 pline2.cssclass = "horizontal-line2-first";             }             else if (i == dt.rows.count - 1)             {                 pitemline2.cssclass = "item-line-level2-last";                 pline2.cssclass = "horizontal-line2-last";             }             else             {                 pitemline2.cssclass = "item-line-level2-middle";                 pline2.cssclass = "horizontal-line2-middle";             }             pitemline2.controls.add(pline2);             plevelline2.controls.add(pitemline2);                 panel pitem2 = new panel();             pitem2.cssclass = "item-level2";              panel pitemcontent2 = new panel();             pitemcontent2.cssclass = "item-level2-content";              lbitem2[i] = new linkbutton();             lbitem2[i].text = dt.rows[i].itemarray[2].tostring();              int current_level1 = (int)dt.rows[i].itemarray[0];             //lbitem2.onclientclick = "alert('" + current_level1 + "')";             //lbitem2.click += new eventhandler((s,e) => evhandler(s,e, current_level1));              lbitem2[i].click += new system.eventhandler(delegate(object o, eventargs a)             {                 evhandler(o, a, current_level1);             });             pitemcontent2.controls.add(lbitem2[i]);             //plevel.controls.add(lbitem);              datatable dt2 = du.getdatatable("select * dbo.prstructure_main level_parent = " + dt.rows[i].itemarray[0]);             panel pmenulevel = new panel();             pmenulevel.cssclass = "menu-level2";              //<div class="menu-level2-items"><a href="#">assets integrity management</a></div>               (int j = 0; j < dt2.rows.count; j++)             {                   panel pmenulevelitems = new panel();                 pmenulevelitems.cssclass = "menu-level2-items";                  linkbutton lbmenuitem = new linkbutton();                 lbmenuitem.text = dt2.rows[j].itemarray[2].tostring();                 int current_level2 = (int)dt2.rows[j].itemarray[0];                  //lbmenuitem.click += new eventhandler(delegate (object o, eventargs ee) { evhandler(s, ee,current_level2)});                  lbmenuitem.click += new eventhandler(delegate (object o, eventargs a)                      {                         evhandler(o, a, current_level2);                     });                   pmenulevelitems.controls.add(lbmenuitem);                 datatable dt3 = du.getdatatable("select * dbo.prstructure_main level_parent = " + dt2.rows[j].itemarray[0]);                   panel psubmenulevel = new panel();                 psubmenulevel.cssclass = "sub-menu-level2";                  //  <div class="sub-menu-level2-items"><a href="#"> business application section </a></div>                 (int k = 0; k < dt3.rows.count; k++)                 {                     panel psubmenulevelitems = new panel();                     psubmenulevelitems.cssclass = "menu-level2-items";                      linkbutton lbsubmenuitem = new linkbutton();                     lbsubmenuitem.text = dt3.rows[k].itemarray[2].tostring();                     int current_level3 = (int)dt3.rows[k].itemarray[0];                      lbmenuitem.click += new eventhandler((s, e) => evhandler(s, e, current_level3));                     psubmenulevelitems.controls.add(lbsubmenuitem);                      psubmenulevel.controls.add(psubmenulevelitems);                 }                      pmenulevelitems.controls.add(psubmenulevel);                  pmenulevel.controls.add(pmenulevelitems);              }              pitemcontent2.controls.add(pmenulevel);              pitem2.controls.add(pitemcontent2);             plevel2.controls.add(pitem2);          }          pmain.controls.add(plevelline2);         pmain.controls.add(plevel2);     }  }

i have problem in section

                        lbmenuitem.click += new eventhandler((s, e) => evhandler(s, e, current_level3));

and handler method

public void evhandler(object s,eventargs e, int somedata){      //response.write(@"<script language='javascript'>alert('" + somedata + "');</script>");     scriptmanager.registerstartupscript(this.page, this.page.gettype(),"err_msg","alert('" + somedata + "');",      true);      buildstructure(somedata); }

it work first time

but when click again make page load.

i think page_load should below

protected void page_load(object sender, eventargs e) {     if(!ispostback){         buildstructure(1);     }  }

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