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PODynamically Created User Controls In C#
 

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    <p>I am working in a C# winforms project and I have a user control which gets loaded upon its selection from a tool-strip menu. I have a dictionary lookup set to occur upon form load of the user control for other functionality. Also, when I close the user control I am just using the ".Hide();" method. I noticed that when I load the user control the first time everything is fine, but when I close it and choose to open it again the 2nd time it creates a new instance of the object thus throwing off my dictionary lookup. Therefore, I wrote some code in an attempt to fix the issue. </p> <p>What I need to do is to somehow say that if an instance of the user control already exists, do not create a new instance of that object. Instead, just make the user control visible again. Therefore I have written code in an attempt to accomplish this purpose. When I select the item the first time, everything is fine. When I hide the user control and try to re-open it again nothing happens.</p> <p>The following is the code I have written for this purpose which occurs upon the selection of the item from the tool-strip menu:</p> <pre><code> if (Controls.ContainsKey("CheckAvailUserControl")) { Controls["CheckAvailUserControl"].Dock = DockStyle.Fill; Controls["CheckAvailUserControl"].Visible = true; Controls["CheckAvailUserControl"].Show(); Controls["CheckAvailUserControl"].Refresh(); } else { UserControl checkAvailUserControlLoad = new CheckAvailUserControl(); Controls.Add(checkAvailUserControlLoad); checkAvailUserControlLoad.Dock = DockStyle.Fill; checkAvailUserControlLoad.Visible = true; checkAvailUserControlLoad.Show(); } </code></pre> <p>When I trace through my code in the debugger it is in fact hitting the right parts of the above if/else statement. Its just not displaying the user control on the screen the 2nd time I attempt to load it.</p> <p>The question is: How do I get the user control to load correctly after I close it, then select it from the tool-strip menu again?</p>
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