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BOOK: Beginning ASP.NET 4.5 : in C# and VB
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Old August 18th, 2013, 02:43 AM
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Default on page 522

After writing the code below

If (e.Entity IsNot Nothing) Then
Dim myPhotoAlbum As PhotoAlbum = CType(e.Entity, PhotoAlbum)
Response.Redirect(String.Format("ManagePhotoAlbum. aspx?PhotoAlbumId={0}",

When I run the page and Insert the Item I don't get redirected but get an error saying:

Unable to cast object of type PlanetWroxModel.PhotoAlbum to type PhotoAlbum

Why is this??????
Old August 18th, 2013, 07:16 AM
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Hi there,

What's the name of the page you're using this code in? Maybe you called it PhotoAlbum.aspx instead of NewPhotoAlbum.aspx? If that's the case, .NET can't differentiate between the model class PhotoAlbum and the Web Form PhotoAlbum. Either rename the page (as well as the class name in the code behind and in the @Page directive), or recreate the page, or prefix PhotoAlbum in the code you posted with this namespace from the model (e.g. something like PlanetWroxModel.PhotoAlbum).

Hope this helps,

Imar Spaanjaars
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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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