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POmake WinForms Tooltip show multiple times on one control?
 

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    <p>I'm trying to use the WinForms Tooltip class on a (WinForms) UserControl that is custom drawn (with GDI+). It's legacy code, but I need to maintain it a few more years. I want Tooltips to show up when the cursor is paused at various places. I don't want to do the calculation to know if I should show the tooltip until the cursor has been paused, which lends itself to determining that information in the Popup event. In the non-working sample code below, I expect that I can move the cursor to any corner on the form and see a tool tip. It seems that if I click to remove a tooltip, I don't see one ever after. And the first tool tip to show is not as immediate as I would expect. How do I make this work?</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace TestToolTip { public partial class Form1 : Form { private readonly ToolTip _tooltip = new ToolTip(); public Form1() { InitializeComponent(); _tooltip.AutoPopDelay = 10000; _tooltip.InitialDelay = 1000; _tooltip.ReshowDelay = 200; _tooltip.Popup += OnTooltipPopup; _tooltip.SetToolTip(this, "you should never see this"); // we need something or it won't ever trigger Popup } private Point _lp; protected override void OnMouseMove(MouseEventArgs e) { _lp = e.Location; base.OnMouseMove(e); } void OnTooltipPopup(object sender, PopupEventArgs e) { string text = null; if (_lp.X &lt; 100 &amp;&amp; _lp.Y &lt; 100) text = "Top Left"; else if (_lp.X &lt; 100 &amp;&amp; _lp.Y &gt; Height - 100) text = "Bottom Left"; else if (_lp.X &gt; Width - 100 &amp;&amp; _lp.Y &lt; 100) text = "Top Right"; else if (_lp.X &gt; Width - 100 &amp;&amp; _lp.Y &gt; Height - 100) text = "Bottom Right"; var existing = _tooltip.GetToolTip(this); if (existing == text) return; if (text != null) _tooltip.SetToolTip(this, text); // calls into this method e.Cancel = true; } } } </code></pre>
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