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    <p>Well, there are a couple of things to note.</p> <p>First of all, <code>HideSelection</code> doesn't hide or unhide the selection. It specifies, whether the selection will be hidden (or not) when the control loses focus. So it's pointless to change it when the <code>TextBox</code> becomes focus'ed.</p> <p>What you're doing in <code>LostFocus</code> is default, btw. Why there is an exception in <code>GotFocus</code> is burried within Windows API, I guess. Maybe some undefined state when <code>HideSelection</code> checks inside a focus changed event whether the TextBox has focus or not or tries to hide the selection which is not shown. Edit: It's not the Windows API on the first hand, but the framework. It tries to "recreate the handle" in the setter of HideSelection <em>if it is changed</em> (don't know why yet - would have to analyse sources) and seems to fail (don't know why either). Edit2: Finally there's some problem in Win32 DestroyWindow - which leads to skipping the creation of the new window. Maybe because the old one is "in use" in the focus change events?</p> <p>Interestingly, as soon as the exception occurs (for me), the <code>LostFocus</code> event is fired, immediately followed by <code>GotFocus</code> which throws another exception a.s.o. thus blocking the GUI. Both assignments to <code>HideSelection</code> throw the exception.</p> <p>Also, when you click the <code>TextBox</code>, any selection is deselected automatically. This, however, is not the <em>reason</em> for the problem, because the exception is thrown if you change focus by pressing Tab (whose normal behaviour is to restore focus). But it may be related (state problems).</p> <p>If you actually want to restore the selection, you could do it like this:</p> <pre><code>int selStart; int selLen; void textBox1_LostFocus(object sender, EventArgs e) { selStart = textBox1.SelectionStart; selLen = textBox1.SelectionLength; } void textBox1_GotFocus(object sender, EventArgs e) { BeginInvoke((Action)(() =&gt; { textBox1.SelectionStart = selStart; textBox1.SelectionLength = selLen; })); } </code></pre>
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    1. COArrrggg, I can't get any rep on here... Always someone way quicker than me. Congratulations, that's you today ;-)!
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    2. COThanks, I didn't notice the actual meaning of HideSelection :)
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