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copied!<p>I tried your situation on a Windows Forms application (.NET 4) and the following worked. I'm not sure why your way of using <code>GetType(T1) Is GetType(T2)</code> isn't working (maybe it has different semantics, like it doesn't consider inheritance) but you can use this instead:</p> <pre><code>Sub Show1() For Each ctrl As Control In Controls If TypeOf ctrl Is UserControl Then ctrl.Hide() End If Next UserControl11.Show() End Sub </code></pre> <p><strong>Update:</strong></p> <p>I checked the MSDN to see why is your code not working. Firstly the <code>TypeOf .. Is</code> operator is the one used to check for whether a type of an object is compatible with another. Here's what they MSDN article at (Link: <a href="http://msdn.microsoft.com/en-us/library/e5kz7s8h%28v=vs.71%29.aspx" rel="nofollow">TypeOf keyword</a>) says:</p> <blockquote> <p>The TypeOf keyword introduces a comparison clause that tests whether an object is derived from or implements a particular type, such as an interface.</p> </blockquote> <p>However you're using the Is keyword (very different from that used in C# to check whether an object is of some particular type). The "Is" keyword is used to check whether two references reference the same object. Here's what MSDN at (Link: <a href="http://msdn.microsoft.com/en-us/library/kb136x1y%28v=vs.71%29.aspx" rel="nofollow">Is keyword</a>) says:</p> <blockquote> <p>[Is] Compares two object reference variables.</p> </blockquote> <p>So I was right: you're using an operator with different semantics than your intentions. I rarely write VB .NET code these days. Nice question.</p>

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