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POCheckbox checked state change when visibility is set to false
 

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    <p>I am having some trouble understanding the impact of setting checkbox visibility on the checked state at various stages in the page life cycle.</p> <p>Given below is a sample code for a dynamically created checkbox.</p> <pre><code> protected override void OnInit(EventArgs e) { base.OnInit(e); check = new CheckBox(); check.AutoPostBack = true; check.Text = "checkbox1"; check.ToolTip = "tooltip for checkbox1"; check.CheckedChanged += new EventHandler(check_CheckedChanged); this.Form.Controls.Add(check); Button btn = new Button(); btn.Text = "click me"; btn.Click += new EventHandler(btn_Click); this.Form.Controls.Add(btn); } protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { check.Checked = true; check.Text = "text reassigned."; check.ToolTip = "tooltip reassigned"; } } protected override void OnPreRenderComplete(EventArgs e) { base.OnPreRenderComplete(e); check.Visible = false; } </code></pre> <p>The issue here is, when a postback occurs (I click on the button), then I notice in the Page_load event, the checkbox maintains the viewstate of the tooltip and text. However the checked state is changed to false and it fires a CheckedChanged event. Why is the behavior so? </p> <p>Also, if I set the visibility of the checkbox in either PageLoad() or the OnPreRender() event, the checked state of the checkbox is maintained across postbacks and does not fire a CheckedChanged event. </p> <p>I'm just curious as to what happens differently when the visibility is changed in the OnPreRenderComplete event so as to have the checkbox default to an unchecked state.</p>
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    1. COWhat's the use of that? Is it curiosity? The page life cycle is a known mystery.
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