Сделайте это косвенно.
например. зарегистрируйте событие двойного щелчка и покажите форму без полей в TextBox, где пользователь может ввести новое имя. Пример:
Labeleditor
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication
{
public partial class LabelEditor : Form
{
private System.Windows.Forms.TextBox textBox;
public LabelEditor()
{
InitializeComponent();
this.textBox = new System.Windows.Forms.TextBox();
this.textBox.Dock = System.Windows.Forms.DockStyle.Fill;
this.textBox.Location = new System.Drawing.Point(0, 0);
this.textBox.Name = "textBox";
this.textBox.Size = new System.Drawing.Size(100, 20);
this.textBox.TabIndex = 0;
this.textBox.KeyDown += new System.Windows.Forms.KeyEventHandler(this.OnKeyDown);
this.AutoSize = true;
this.ClientSize = new System.Drawing.Size(100, 20);
this.Controls.Add(textBox);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.MinimumSize = new System.Drawing.Size(100, 20);
this.Name = "LabelEditor";
this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
}
public override string Text
{
get
{
if (textBox == null)
return String.Empty;
return textBox.Text;
}
set
{
textBox.Text = value;
ResizeEditor();
}
}
private void ResizeEditor()
{
var size = TextRenderer.MeasureText(textBox.Text, textBox.Font);
size.Width += 20;
this.Size = size;
}
private void OnKeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyData)
{
case Keys.Escape:
DialogResult = DialogResult.Cancel;
this.Close();
break;
case Keys.Return:
DialogResult = DialogResult.OK;
this.Close();
break;
}
}
}
}
Форма
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication
{
public partial class Form1 : Form
{
private Label EditableLabel;
public Form1()
{
InitializeComponent();
this.EditableLabel = new System.Windows.Forms.Label();
this.EditableLabel.AutoSize = true;
this.EditableLabel.Location = new System.Drawing.Point(102, 81);
this.EditableLabel.Text = "Click me to change...";
this.EditableLabel.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler(this.LabelMouseDoubleClick);
this.Controls.Add(this.EditableLabel);
}
private void LabelMouseDoubleClick(object sender, MouseEventArgs e)
{
var label = sender as Label;
if (label != null)
{
var editor = new LabelEditor();
editor.Location = label.PointToScreen(new Point(e.X + 5, e.Y + 5));
editor.Text = label.Text;
if (DialogResult.OK == editor.ShowDialog())
{
label.Text = editor.Text;
}
}
}
}
}