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I got in Design View some error codes like this:
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Error Creating Control - 1stOperator Cannot find web project item 'C:\BegASPNET\Source\Chapter 05\CalculatorDemo.aspx'
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In a dialog box that appear, it says: "Property value not valid"
Belive something is not tuned in my VWD ?
If me enter Ctrl-F5 inside Markup View it seems to be running fine in the browsers Firefox/IE.
(I got the same errors then a run the source-files from Wrox)
Haha, well, don't worry about it. You're not the first one to report it.
In hindsight, it would have been better to have called the control listOperator or ddlOperator (as in DropDownList) or simply Operator without any form of Hungarian notation...