System.Windows.Forms.ListBox.GetItemHeight C# (CSharp) Method

		public int GetItemHeight (int index)
		{
			if (index < 0 || index >= Items.Count)
				throw new ArgumentOutOfRangeException ("Index of out range");
				
			if (DrawMode == DrawMode.OwnerDrawVariable && IsHandleCreated == true) {
				
				//ItemHeight
			}

			return ItemHeight;
		}
		

        /// <summary>
        /// Show a listbox with possible completions for the uncompleted string.
        /// When the user chooses one and presses enter (or clicks it with the mouse),
        /// return the chosen completion. Or, when the user presses escape, then 
        /// close the window and return null.
        /// </summary>        
        public string ShowTooltip(string uncompleted, IEnumerable<string> completions, IEnumerable<string> documentations,Point location)
        {
            _lstCompletions = new ListBox();
            _lstCompletions.ScrollAlwaysVisible = true;
            _lstCompletions.Items.AddRange(completions.ToArray());
            _lstCompletions.SelectionMode = SelectionMode.One;
            _lstCompletions.AutoSize = false;
            _lstCompletions.SelectedIndexChanged += new EventHandler(selectedIndexChanged);
            _lstCompletions.Click += new EventHandler(lstCompletionsClicked);

            int maxWidth = 0;
            for (int i = 0; i < _lstCompletions.Items.Count; i++)
            {
                if (_lstCompletions.GetItemRectangle(i).Width > maxWidth)
                    maxWidth = _lstCompletions.GetItemRectangle(i).Width;
            }
            _lstCompletions.Width = maxWidth;
            if (_lstCompletions.Items.Count > 0)
                _lstCompletions.Height = _lstCompletions.GetItemHeight(0) * 10;

            _documentations = documentations;
            _lblDocumentation = new TextBox();
            _lblDocumentation.WordWrap = true;
            _lblDocumentation.Width = _lstCompletions.Width;
            _lblDocumentation.BackColor = SystemColors.ControlLight;
            if (_documentations!=null && _documentations.Count() > 0)
                _lblDocumentation.Text = _documentations.ElementAt(0);
            _lblDocumentation.ScrollBars = ScrollBars.Vertical;
            _lblDocumentation.Multiline = true;
            _lblDocumentation.AutoSize = true;
            _lblDocumentation.Height = 100;
            _lblDocumentation.ReadOnly = true;

            _dialog = new CompletionToolTipWindow(_lstCompletions,_lblDocumentation);
            _dialog.KeyDown += new KeyEventHandler(dialog_KeyDown);
            _dialog.Location = location;
            _dialog.KeyPreview = true;
            _dialog.ShowDialog();

            if (_cancel || _lstCompletions.SelectedIndex < 0)
                return null;

            return (string)_lstCompletions.SelectedItem;
        }