Add this in Page_Loaded
==========================
if (DesignerProperties.GetIsInDesignMode(this))
return;
To avoid this problem, be sure to check if you use HtmlPage class in Page_Loaded.
If inside Page_Loaded you call another functions, make sure they do not call HtmlPage class. Otherwise, use the if statement I provided above.
Reference:
http://www.andybeaulieu.com/Home/tabid/67/EntryID/158/Default.aspx
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