c# - Adding items in ListView too slow -

i have listview , add items one-by-one loop
listview has checkboxes

in loop decide whether checkbox should checked or not
problem if many checkboxes should checked adding items slow
here code:

for (int = 0; < dt.rows.count; i++) {     datarow drow = dt.rows[i];      // row have not been deleted     if (drow.rowstate != datarowstate.deleted && int.parse(drow["season"].tostring()) != 0)     {         listviewitem lvi = new listviewitem(drow["episode_name"].tostring());          lvi.subitems.add(drow["first_aired"].tostring());         lvi.subitems.add(drow["episode"].tostring());         lvi.subitems.add(drow["season"].tostring());         lvi.subitems.add(drow["rating"].tostring());         lvi.subitems.add(drow["episode_id"].tostring());         if (bool.parse(drow["watched"].tostring()))         {             lvi.checked = true; //this problem, when remove it, adding fast         }         else {             lvi.checked = false;         }         episodeslist.items.add(lvi);     } } 

how can make faster?

on listview, call .beginupdate() while you're loading in results. after you're finished, call .endupdate(). should speed it's not trying process , draw @ same time.

// wait draw episodeslist.beginupdate();  // add items  // draw episodeslist.endupdate(); 

edit

as justin suggested, addrange() some, won't eliminate problem. see: how speed adding items listview?

edit #2

since event handlers causing issue, can work around them removing handlers during load , re-adding them after. or, can use global boolean _isloading set before load , after , can check _isloading in handlers don't make trip db. removing/readding handler cleaner solution, though.

removing event handlers