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Missing Viewstate in Custom Control

Mark Sisson
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Easy one for gurus::::
Could someone tell me why this custom control bombs during postback?

To duplicate: compile this control, put it in your toolbox, drag it to
a new form, add a button to the form, run the form, hit the button.
Voila! The control doesn't remember it's ViewState.


using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace ViewStateTestControl
public class WebCustomControl1 :
System.Web.UI.WebControls.WebControl, INamingContainer
public WebCustomControl1()
this.EnableViewState = true;
protected override void Render(HtmlTextWriter output)
if (!Page.IsPostBack) ViewState["a"] = "a";
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