Question

I have a database table (named Topics) which includes these fields :

1. topicId
2. name
3. parentId

and by using them I wanna populate a TreeView in c#. How can I do that ?

Thanks in advance…

Answer 1

It will probably be something like this. Give some more detail as to what exactly you want to do if you need more.

//In Page load foreach (DataRow row in topics.Rows) {     TreeNode node = new TreeNode(dr['name'], dr['topicId'])     node.PopulateOnDemand = true;       TreeView1.Nodes.Add(node);  }  ///  protected void PopulateNode(Object sender, TreeNodeEventArgs e)  {      string topicId = e.Node.Value;      //select from topic where parentId = topicId.      foreach (DataRow row in topics.Rows)      {          TreeNode node = new TreeNode(dr['name'], dr['topicId'])          node.PopulateOnDemand = true;           e.Node.ChildNodes.Add(node);      }   }