BoxDiagrams.TextBox.OnKeyDown C# (CSharp) Method

		public override void OnKeyDown(KeyEventArgs e)
		{
			if (e.Modifiers == 0 && e.KeyCode == Keys.Back && Text.Length > 0)
			{
				char last = Text[Text.Length-1];
				UndoStack.Do(@do => {
					if (@do)
						this.Text = this.Text.Left(this.Text.Length - 1);
					else
						this.Text += last;
				}, true);
			}
		}