Classe NodeLabelEditEventArgs

/* Get the tree node under the mouse pointer and 
   save it in the mySelectedNode variable. */privatevoid treeView1_MouseDown(object sender, 
  System.Windows.Forms.MouseEventArgs e)
{
   mySelectedNode = treeView1.GetNodeAt(e.X, e.Y);
}

privatevoid menuItem1_Click(object sender, System.EventArgs e)
{
   if (mySelectedNode != null && mySelectedNode.Parent != null)
   {
      treeView1.SelectedNode = mySelectedNode;
      treeView1.LabelEdit = true;
      if(!mySelectedNode.IsEditing)
      {
         mySelectedNode.BeginEdit();
      }
   }
   else
   {
      MessageBox.Show("No tree node selected or selected node is a root node.\n" + 
         "Editing of root nodes is not allowed.", "Invalid selection");
   }
}

privatevoid treeView1_AfterLabelEdit(object sender, 
         System.Windows.Forms.NodeLabelEditEventArgs e)
{
   if (e.Label != null)
   {
     if(e.Label.Length > 0)
     {
        if (e.Label.IndexOfAny(newchar[]{'@', '.', ',', '!'}) == -1)
        {
           // Stop editing without canceling the label change.
           e.Node.EndEdit(false);
        }
        else
        {
           /* Cancel the label edit action, inform the user, and 
              place the node in edit mode again. */
           e.CancelEdit = true;
           MessageBox.Show("Invalid tree node label.\n" + 
              "The invalid characters are: '@','.', ',', '!'", 
              "Node Label Edit");
           e.Node.BeginEdit();
        }
     }
     else
     {
        /* Cancel the label edit action, inform the user, and 
           place the node in edit mode again. */
        e.CancelEdit = true;
        MessageBox.Show("Invalid tree node label.\nThe label cannot be blank", 
           "Node Label Edit");
        e.Node.BeginEdit();
     }
     this.treeView1.LabelEdit = false;
   }
}

/* Get the tree node under the mouse pointer and 
   save it in the mySelectedNode variable. 
 */
private void treeView1_MouseDown(Object sender, 
                                 System.Windows.Forms.MouseEventArgs e)
{
    mySelectedNode = treeView1.GetNodeAt(e.get_X(), e.get_Y());
} //treeView1_MouseDown

private void menuItem1_Click(Object sender, System.EventArgs e)
{
    if (mySelectedNode != null && mySelectedNode.get_Parent() != null) {
        treeView1.set_SelectedNode(mySelectedNode);
        treeView1.set_LabelEdit(true);
        if (!(mySelectedNode.get_IsEditing())) {
            mySelectedNode.BeginEdit();
        }
    }
    else {
        MessageBox.Show("No tree node selected or selected node"
            + "is a root node.\n" 
            + "Editing of root nodes is not allowed.", "Invalid selection");
    }
} //menuItem1_Click

private void treeView1_AfterLabelEdit(Object sender, 
                            System.Windows.Forms.NodeLabelEditEventArgs e)
{
    if (e.get_Label()!= null) {
        if (e.get_Label().length() > 0) {
            if (e.get_Label().IndexOfAny((new char[]{ '@', '.', ',', '!' }))
                == -1) {
                // Stop editing without canceling the label change.
                e.get_Node().EndEdit(false);
            }
            else {
                /* Cancel the label edit action, inform the user, and 
                   place the node in edit mode again. 
                 */
                e.set_CancelEdit(true);
                MessageBox.Show("Invalid tree node label.\n" 
                    + "The invalid characters are: "
                    + "'@','.', ',', '!'", "Node Label Edit");
                e.get_Node().BeginEdit();
            }
        }
        else {
            /* Cancel the label edit action, inform the user, and 
               place the node in edit mode again.
             */
            e.set_CancelEdit(true);
            MessageBox.Show("Invalid tree node label.\n"
                + "The label cannot be blank", "Node Label Edit");
            e.get_Node().BeginEdit();
        }
        this.treeView1.set_LabelEdit(false);
    }
} //treeView1_AfterLabelEdit