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PODynamically Populated TableLayoutPanel Performance Degredation
 

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    <p>I have a user control that contains a 2-column TableLayoutPanel and accepts commands to dynamically add rows to display details of an item selected in a separate control. So, the user will select a row in the other control (a DataGridView), and in the SelectedItemChanged event handler for the DataGridView I clear the detail control and then regenerate all the rows for the new selected item (which may have a totally different detail display from the previously selected item). This works great for a while. But if I keep moving from one selected item to another for quite a long time, the refreshes become VERY slow (3-5 seconds each). That makes it sound like I'm not disposing everything properly, but I can't figure out what I'm missing. Here's my code for clearing the TableLayoutPanel:</p> <pre><code>private readonly List&lt;Control&gt; controls; public void Clear() { detailTable.Visible = false; detailTable.SuspendLayout(); SuspendLayout(); detailTable.RowStyles.Clear(); detailTable.Controls.Clear(); DisposeAndClearControls(); detailTable.RowCount = 0; detailTable.ColumnCount = 2; } private void DisposeAndClearControls() { foreach (Control control in controls) { control.Dispose(); } controls.Clear(); } </code></pre> <p>And once I get finished loading up all the controls I want into the TableLayoutPanel for the next detail display here's what I call:</p> <pre><code>public void Render() { detailTable.ResumeLayout(false); detailTable.PerformLayout(); ResumeLayout(false); detailTable.Visible = true; } </code></pre> <p>I'm not using anything but labels (and a TextBox very rarely) inside the TableLayoutPanel, and I add the Labels and TextBoxes to the controls list (referenced in DisposeAndClearControls()) when I create them. I tried just iterating over detailTable.Controls and disposing them that way, but it seemed to miss half the controls (determined by stepping through it in the debugger). This way I know I get them all.</p> <p>I'd be interested in any suggestions to improve drawing performance, but particularly what's causing the degradation over multiple selections.</p>
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