Populating the TreeView

Question

Hello, I am recently creating a form that has a tree view in it. I want to populate the treeview through database. Help Required. Thanx in advance. Regards!

kiran kumar · Answer

TreeNode Online = new TreeNode(); conn.Open(); SqlCommand cmd = new SqlCommand(getOnline,conn); SqlDataReader reader = null; this.trv_ShowUsers.Nodes.Add(Online); reader = cmd.ExecuteReader(); while (reader.Read()) { Online.Text = "Online Users"; Online.Nodes.Add(reader[0].ToString()); } conn.Close(); mark the answer if it helps you

Farrukh Javeid · Answer

Hello Kiran, Thanx for the help. This thing is started to work now :). You're the best! Regards!

Farrukh Javeid · Answer

Hello Kiran, Thanx for the response. My query for the retrieval of record is string getOnline = "Select Friend from FriendList"; and it gets all the fields in the 'Friend' column and put them in the tree view under the same Root/Node i.e. Online. Any information about the exception? Thanx for the code and the response. Regards!

kiran kumar · Answer

what is your query to be executed,you want to get a single row,or you want to get all the rows to treeview... MARK THE ANSWER IF IT HELPED YOU

Farrukh Javeid · Answer

TreeNode Online = new TreeNode(); conn.Open(); SqlCommand cmd = new SqlCommand(getOnline,conn); SqlDataReader reader = null; reader = cmd.ExecuteReader(); while (reader.Read()) { this.trv_ShowUsers.Nodes.Add(Online); Online.Text = "Online Users"; Online.Nodes.Add(reader[0].ToString()); } conn.Close(); This is the code but its giving the exception of "Cannot add or insert the item 'Online Users' in more than one place. You must first remove it from its current location or clone it.".

kiran kumar · Answer

hello rashid,i am helping you with complete code and design... suppose this is my database table rollno name class 1231 kiran 10 1232 kumar 9 1233 kkk 8 CHECK THE CODE using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.SqlClient; namespace treeview { public partial class Form1 : Form { TreeView tr = new TreeView(); TreeNode[] student = new TreeNode[10]; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { this.tr.Location = new Point(60, 35); this.tr.Size = new Size(341, 246); SqlConnection con = new SqlConnection("Data Source=KIRAN\SQLEXPRESS;Initial Catalog=kiran;Integrated Security=True"); con.Open(); SqlCommand cmd = new SqlCommand("select * from tree",con); SqlDataReader dr = cmd.ExecuteReader(); int i=0; while (dr.Read()) { i++; student[i] = new TreeNode(); student[i].Text = "student"+i+""; this.tr.Nodes.Add(student[i]); this.student[i].Nodes.Add(dr["rollno"].ToString()); this.student[i].Nodes.Add(dr["name"].ToString()); this.student[i].Nodes.Add(dr["class"].ToString()); } con.Close(); this.Controls.Add(tr); } } } MARK THE ANSWER IF IT HELPED YOU