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copied!<p>At first sight, I would take a look at the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.windowstate.aspx" rel="nofollow noreferrer"><code>Form.WindowsState</code></a> property, if you haven't already. I doubt that if you happen to set this property to <code>FormWindowState.Maximized</code> on design, this would be changed when setting their <code>Visible</code> property <code>true</code>/<code>false</code>.</p> <p>For the "[...] every child form gets redrawn in succession [...]"-thing, have you tried to use the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.suspendlayout.aspx" rel="nofollow noreferrer"><code>SuspendLayout()</code></a> method on the beginning of the active user's forms verification, and calling <a href="http://msdn.microsoft.com/en-us/library/y53zat12.aspx" rel="nofollow noreferrer"><code>ResumeLayout()</code></a> afterwards?</p> <p><strong>EDIT #1</strong></p> <ul> <li>I would advise you to load only the required <code>Form</code> for the current user.</li> </ul> <blockquote> <p>Doing so will reduce the amount of memory used by your application, plus, it shall reduce considerably the number of forms contained within the <code>MdiChildren</code> collection property. Then, iterating through the collection, if still required, will be faster.</p> </blockquote> <p>If this isn't an option for you, then perhaps using <strong>Linq</strong> might help:</p> <pre><code>var visibleForms = from f in MdiChildren where (((OfficeFormEx)f).UserID == (int)e.NewTab.Tag) select f; var invisibleForms = from f in MdiChildren where (((OfficeFormEx)f).UserID != (int)e.NewTab.Tag) select f visibleForms.ToList().ForEach(f => f.Visible = true); invisibleForms.ToList().ForEach(f => f.Visible = false); </code></pre> <p><em>If you're using .NET 4.0, perhaps would this be a good candidate for <a href="http://msdn.microsoft.com/en-us/magazine/cc163329.aspx" rel="nofollow noreferrer"><strong><code>PLINQ</code></em></strong></a></p> <p>Please provide feedback so that we can come to a solution. =)</p>

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