Tree view control

Question

Hi i am having one problem.i have used a tree view control in master page whice have been populated dynamically from the database(Ms sql).When i click on a child node a page should open in a content page only.but in my case when a user clicks on a child node whole page gets refreshed. Another problem is when a user clicks on a child node  all the child nodes also gets collapse.what should i do to retain childnodes expanded .i have tried treenode.expandall(); properties but it expand tree node on pageload . i dont want it.what i need to do is  a tree view collapsed on pageload and when a user clicks on a parent node then only child node should expand and it should remain expanded until a user wants it to collapse .plz help me as soon as possible. thanks in advance

monsyak · Answer

At the time of pageload you do not use ExpandALL property of tree control. After populate the tree node use some logic to find the treenode is expanded or not. I think it is better to write before adding nodes into the tree. Before doing the above checking when a node is expanded(I think some event is there to find a node is expanded) try to make a list of expanded nodes. string cookieEntryName = ExpandedNodes_ + ; string cookieName = ExpandedNodes + ; string expandedNodeIds = this.GetCookieValue(cookieName cookieEntryName); if (string.Empty != expandedSiteIds) { expandedSiteIds += ; } expandedNodeIds += siteId.ToString(); this.SetCookieValue(cookieName cookieEntryName expandedNodeIds ); So each time a node is expanded then the string expandedNodeIds wll be grow with a comma seperator and you can check this string whenever you want to know the node is in expanded state. For example when a page rfresh is happening the tree will be populated again. I think this time when you add a node into the tree you can check this node is available in the string expandedNodeIds (The logic is showing below..pls write in your perspective) private bool IsExpanded(int nodeId string strExpandedSitesIds) { bool expanded = false; if (string.Empty != strExpandedSitesIds && null != strExpandedSitesIds) { char[] separator = { '' }; //split the list into separate strings string[] substr = strExpandedSitesIds.Split(separator); //check if the node is expanded from the cookie list string strId = nodeId.ToString(); if (strId != string.Empty) { //check if the string is present in the list foreach (string tmpStr in substr) { if (strId == tmpStr) { expanded = true; break; } } } } return expanded; } If this function returns true you can set the property of parent node is true and set false in other case. So after the population of tree you will get the sites which you expanded before the page refresh or any other event. N:B I suggested a logic and skeleton of code. You can give a try. Fortunately I hav not use this tree control yet.