Dynamically add nodes

 

 

code show as below

 

 

        private void tvMen_AfterSelect(object sender, TreeViewEventArgs e)
        {
            // Judge the node level, if it is not the root node, when selected, the corresponding value will be displayed in the text box 
            if ( this .tvMen.SelectedNode.Level != 0 )
            {
                // Display the text of the node in the text box 
                this .textBox123.Text = e.Node.Text;
            }
            {
                
            }
        }
        // Add root node 
        private  void btgjd_Click( object sender, EventArgs e)
        {
            if (this.textBox123.Text != string.Empty) 
            {
                // Create a node object 
                TreeNode rootNode = new TreeNode( this .textBox123.Text);
                 // Add node as TreeViwe root node 
                this .tvMen.Nodes.Add(rootNode);
            }
            {
                
            }
        }
        // Add a child node to a node in the TreeView control 
        private  void btzjd_Click( object sender, EventArgs e)
        {
            // Check that the text box is not empty and select a node 
            if ( this .textBox123.Text != string .Empty && this .tvMen.SelectedNode != null )
            {
                // Create a child node object 
                TreeNode child = new TreeNode( this .textBox123.Text);
                 // Add the node as the selected child node 
                this .tvMen.SelectedNode.Nodes.Add(child);
            }
            else 
            {
                MessageBox.Show( " Please select a root node " );
            }
        }
    }