What does the following statement do, it is at page 230 try it out, can anyone please help explain

Dim folder As String = Server.MapPath("~/App_Themes/" & preferredTheme.Value)
If System.IO.Directory.Exists(folder) Then
Page.Theme = preferredTheme.Value

It checks if the user selected theme held in the cookie exists on disk before applying it. This is helpful if you rename a theme and users still have an old cookie. Without it, the code will crash when you try to assign a theme that doesn't exist.

Imar

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Imar Spaanjaars
http://Imar.Spaanjaars.Com
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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