c# - Search box in treeview with keyword search in asp.net -

i have treeview populated using database connection. want add search box treeview keyword search , returns parent nodes of trreview have keywords entered in search box.

do have make new treeview , apply search on , display treeviw if keyword in search box matches or can search in original treeview , show matched nodes , make visibility false others.

i have far written code only

       string searchtxt = txt_search.text.trim();          foreach (treenode node in folderstructure.nodes)         {             if (node.text.startswith(txt_search.text.trim()))             {                 node.select();                 txt_search.text = "";             }         } 

every suggestion welcomed.

thanks